If sexist mean to be equal between men and women it would be hard then to make thing equal between two different thing.
Even today sexist will be everywhere, some only talk about one side and wont look at it fully.
Rarely we heard someone said that is sexist when watching sport when team or the athlete only consist of one gender, and not competing equally without
making female or male version. Or like a liability when couple divorced the guy not saying why i must pay some money every month but why not her.
Talking about equality rigidly will make us hard to find center point of this.
So if sexist mean men and women not equal in all aspect, what is wrong then being a sexist wd be the next question.

