You know how people like to talk things about people behind their backs? Its funny, because we all do it even though we hate it if we were the topic but yea, we still do it.
We see someone doing things that others seldom do, we talk about them, laugh over it. Then leave an impression on others who might not even really know the person, the impression that he/she is a weirdo.
So you see, all of us can actually leave impressions on anyone, even strangers who haven't even seen us before.
See how idols or stars get popular? We introduce them to each other. Because they stand out so much, good or bad, we talk about them.

Some people talk about someone they hate, so that others hate that someone too; and also to make sure people thinks they are right, so that they side them. We all do that. Eventually, everyone who hears about that someone start to observe if he/she is really like this. So yeah, lets say many other people do it too, but only one is being talked about. People observe that person, and confirmed that the rumors are right. Ta-da, no friends for him/her.

So much for being unique, being special. If you're unique in a way people disapprove of, you get criticized; well if the audience approve of your specialty, lucky you. That's the reality.

Oh but look, aren't everyone of us special? Yes, we are all different. That's why we judge each other, put labels on everyone, and constantly trying to prove to people that we are very common, normal; yet sometimes we want to stand out, but of course in the way people will approve of.

The irony. I don't even know what all of us want actually.