The principle goal of education in the schools should be creating men and women who are capable of doing new things, not simply repeating what other generations have done.
Many differences are rooted in biology and reinforced through culture, so it’s important to acknowledge that. Because if you say men and women are the same and if male behaviour is the norm, and women are always expected to act like men, we will never be as good at being men as men are.
You don’t argue with a four-year old about why he shouldn’t eat candy for dinner. You don’t punch a mentally handicapped guy even if he punches you first. And you don’t argue when a women tells you she’s only making 80 cents to your dollar. It’s the path of least resistance. You save your energy for more important battles.