Gender Double Standards!!!??????/?

Why are there so many double standards against men. For example, the feminists claim to be for total, unmitigated equality, yet they say men shouldn't hit women even if men are hit first. Its just so wrong. Also, how about the fact that female porn actors earn on average 7 times more than the male porn actors. Isn't this institutional sexism. Huh? It's just very unfair. Just too many double standards.