Ok, i am going to break it down, for all who do not understand the word "sexist".
Sexist means to have Wrong feeling towards the opposite gender, It mostly happens to Girls.It has nothing to do with sex. For example, " A girl is walking in a school hall way, and a boy says, " Girls are so weak, i bet they couldn't lift a pound, they are lower than boys" That is sexist
It is very rude, and is mostly done in insults. Girls can be sexist to, it just more likely you would hear that from a boy, Personaly i do not Get mad at boys for saying that, It think its stupid, and immature, My motto is "anything,boys can do we can do to" No one is better than another.Thats my oppinon ^.^