Why are some pretty girls mean?

-I'm just asking.They think just because they are pretty that they can get whatever they want. It's been like that for years and the only thing to do about it is to completely ignore them. they may not end up working at mcdonalds they may not end up models but you should concentrate on yourself. I know it's hard to ignore them because all eyes are on them but still you gotta look the other way and try to find your own happiness.Cause, they think they're all that cause they're pretty, and only want to be friends with the popular, cool, pretty people and be mean to the rest.
because they know they are pretty and they are stuck up and want everybody know it
they know they're pretty so they don't care what anybody thinks, they think they own it all! and most guys wouldn't care as long as their pretty.
Because they are insecure about themselves.
b/c they think b/c their pretty they can be mean.