EDIT: Oops, wrong thread.
Anyway, there is a comment that I've seen a few times and I can't remember it correctly so my less eloquent version would be "some men are afraid that they might be treated the way they are treating women."
Actually, similar comment has been made about minorities. White supremacists have an irrational fear of becoming a minority in their own country only because they think that they would get the same treatment that they want to give to minorities.