Why are some girls on here so mean to pretty girls?

why do people think that when a pretty girl post her pic up asking whats their first impression of them or how old do they think they are , they think they are "fishing for compliments" because "they know they are pretty" .some pretty people seriously dont even know they are pretty and some have pretty low self esteems but yet other girls on here think they are "fishing for compliments" .so they are so mean to them .some people have whats know as "ugly duckling syndrome" but its like everyone thinks because a girl is pretty she has NO problems with herself .and that she has this perfect little life .now dont get me wrong, ive known some pretty girls who were absolute snobs and thinks the world revolves around them..but all pretty girls arent like that whats the deal with this ladies? why so mean to the pretty girls?

BEST ANSWER:

Some people are just mean, and they have a low self esteem and need to make themselves feel better .Also some people think all pretty girls are like snobs and suck up and mean to everyone so they think it's okay to be nasty to them and sometimes people see them as competition and some are just mean and are jealous there is a girl in my grade and shes always mean to the pretty girls .She is just jealous of everyone