>>13415465I'm not sure it's inherent to femalehood, I think it may have to do with having no one to put you in our place when you're a mean girl. You grow up that way, you keep picking on boys or other girls, and there is no parent or teacher to tell you to do otherwise.
Boys get told "don't do this, don't do that" often, but girls, not so much.
That, and sexual frustration perhaps.