Sometimes you meet someone and instantly feel put off for reasons you can’t quite put your finger on.

They’re perfectly nice and haven’t done anything offensive or rude, you just… don’t like them and don’t know why. You might feel bad for judging them so harshly without actually knowing them, but don’t — this is actually a completely natural response, and it happens to everyone. However, understanding what causes this knee-jerk reaction to some people might make you more likely to cut yourself some slack, so the next time it happens to you, consider whether any of these things apply to the situation/the person in question.
1. They remind you of someone else you don’t like.

Sometimes, an instant dislike happens because the person reminds you of someone else you’ve had a bad experience with. It could be their mannerisms, tone of voice, or even their appearance. Without realising it, your brain makes a connection between them and those past negative feelings. Your reaction isn’t really about the new person — it’s your subconscious stirring up old emotions. While it’s unfair to judge someone based on associations, it’s a natural response. Recognising that can help you take a step back and separate the two people in your mind, giving the new person a fair chance.
2. Their energy feels off.

Energy is a big deal when it comes to first impressions. Sometimes, someone’s vibe might come across as overly intense, overly aloof, or just mismatched to yours, and that can create a sense of discomfort or unease without a clear explanation. What’s weird about this is that it’s entirely subjective. Their energy might not be “bad,” but it might clash with yours. Recognising the mismatch doesn’t mean you have to write them off — it just proves how personal dynamics can play a huge role in how we feel about people.
3. They interrupt too much.

When someone doesn’t let you finish your sentences or constantly talks over you, it can instantly rub you the wrong way. It feels like they’re not interested in listening, which can come across as dismissive or self-centred, even if they don’t mean to be. Sometimes, that kind of behaviour stems from excitement or nerves rather than rudeness. However, it still creates a barrier to connection. If you notice this habit, it might be worth considering whether the issue is situational or a deeper sign of mismatched communication styles.
4. They don’t match your sense of humour.

A shared sense of humour can build instant connections, but when someone’s jokes don’t land — or worse, feel offensive — it can create the opposite effect. Different humour styles can make interactions feel awkward or strained, especially if they lean into sarcasm or jokes that you just don’t find funny. The clash can be a big hurdle in forming a bond. While humour isn’t everything, it’s often a shortcut to building trust and comfort. If you’re not laughing together, it’s easy to feel disconnected, even if they’re lovely in other ways.
5. They seem overly critical.

Meeting someone who immediately criticises something — whether it’s you, other people, or their surroundings — can leave a bad taste. Negativity is contagious, and when it’s the first thing you notice about someone, it can make them seem unpleasant or hard to be around. What’s interesting is that overly critical behaviour often stems from their own insecurities. They might not realise how they’re coming across, but it still creates a barrier. Recognising this doesn’t excuse the behaviour, but it can give you some perspective on why you’re feeling that initial dislike.
6. They dominate the conversation.
When someone talks non-stop without giving you a chance to contribute, it can feel draining. It’s easy to feel like they’re not interested in getting to know you, and instead, they just want an audience. A one-sided dynamic often feels uncomfortable and off-putting. It’s worth noting that this could be a result of nerves or excitement, rather than intentional self-centredness. However, it still creates a dynamic that feels imbalanced. When conversations feel more like monologues, it’s hard to build the kind of rapport that creates comfort and connection.
7. They seem disingenuous.

We all have a sense for authenticity, and when someone comes across as fake or insincere, it’s hard to warm to them. Whether it’s forced compliments or overly rehearsed behaviour, that lack of authenticity can create an instant wall between you and them. Often, this perception of insincerity isn’t malicious; it could be their way of trying to impress or fit in. Still, it makes genuine connection tough, if not outright impossible. People tend to connect best with those who feel real, flaws and all, so overly polished behaviour can have the opposite effect of what’s intended.
8. Their body language feels closed off.

Non-verbal cues play a huge role in how we see people and what we think of them. Crossed arms, avoiding eye contact, or a lack of warmth in their posture can make someone seem unapproachable. Even if their words are friendly, their body language might send a conflicting message. Body language can often reveal more than people realise. If someone’s actions don’t align with their words, it’s natural to feel unsure about them. Understanding the mismatch might help you see whether it’s intentional or just a habit, but it’s still a barrier to forming a connection.
9. They mirror behaviours you dislike in yourself.

Sometimes, the things we dislike most about other people are the very traits we struggle with ourselves. Whether it’s impatience, arrogance, or something else entirely, seeing it in someone else can hit a nerve. It’s not that they’re doing anything terrible, it’s that they’re unknowingly holding up a mirror. That realisation can feel uncomfortable, but it’s also an opportunity for self-awareness. Noticing these traits might make you reflect on your own behaviours and how you’re working to change them. It’s a tough pill to swallow, but it can shift your perspective and soften your reaction to the other person.
10. Their tone feels condescending.

A condescending tone can create instant tension, even if the person doesn’t mean any harm. When someone’s way of speaking feels dismissive or patronising, it’s hard not to take it personally. That kind of interaction can leave you feeling undervalued or small, which is never a good first impression. In many cases, this tone might be unintentional — a result of nervousness or even their natural way of speaking. However, it still impacts how comfortable you feel around them. Addressing tone isn’t always possible, but being aware of why it affects you can help ease that initial discomfort.
11. They invade your personal space.

Personal space is, well, personal, and when someone crosses that invisible boundary, it can feel unsettling. Whether they stand too close, touch without permission, or seem oblivious to your comfort zone, it’s easy to feel defensive or irritated in these situations. That reaction is rooted in instinct; personal space is tied to feelings of safety and respect. While cultural differences or social awkwardness might explain the behaviour, it doesn’t change your immediate reaction. Understanding the boundary can help you navigate the situation without feeling too thrown off.
12. They lack basic manners.

Simple things like saying “please” and “thank you” go a long way in making a good impression. When someone is rude to wait staff, dismissive in conversation, or just generally lacks courtesy, it’s hard not to feel put off. Basic politeness matters more than people realise. It’s not about being overly formal — it’s about showing respect for people. When someone skips over these small but important gestures, it creates an impression of entitlement or thoughtlessness. It’s a subtle thing, but it has a big impact on how we feel about someone new.
13. They bring a lot of drama.

If someone’s energy feels chaotic or overly dramatic, it can be draining to engage with them. Constant complaints, exaggerated stories, or a need for attention can make them seem exhausting to be around, even in small doses. It’s like being caught in a whirlwind when you were hoping for calm. What’s interesting is that this behaviour often comes from a need for validation or connection, even if it’s misplaced. While it’s easy to dislike the drama, recognising where it might come from can add a layer of understanding. Still, it doesn’t make it easier to connect with someone who feels emotionally overwhelming.
14. Their values clash with yours.

Disliking someone isn’t always down to their behaviour — it could be their values that rub you the wrong way. If you sense that someone’s outlook or priorities are completely different from yours, it can create an unspoken tension. The clash doesn’t have to be overt to be noticeable; it’s often subtle but powerful. Values play a big role in how we relate to people, so this kind of mismatch can feel jarring. It doesn’t mean either person is wrong — it just means you’re coming from different places. Recognising that can help you navigate the situation with a little more empathy, even if the connection doesn’t feel natural.
15. Your gut just says no.

Sometimes, there’s no clear explanation — you just don’t click with someone. Your gut instinct kicks in, telling you something feels off. It’s not always logical, but it’s a powerful reaction that can shape how you approach the interaction. Trusting your gut doesn’t mean you’re right about someone, but it’s worth paying attention to. Often, this feeling is tied to subtle cues your brain picks up on, even if you’re not fully aware of them. While first impressions matter, giving someone the benefit of the doubt might reveal a deeper connection than you expected.