People use them to feel good about themselves, to put people down and to make fun of them on how they are.
Also called, Labels.
Which are completelty f***ed up.
Labels can suck on my asshole.
Ryan: "Hey look at that emo kid over there. HEY GO CUT YOURSELF F***ING EMO!"
Dan: "Hey man, that's pretty rude of you to say, if you looked 'emo', would you want someone else telling you to go cut yourself? I don't think so. Don't stereotype people."