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I see your point, but I would phrase it differently, as in "People who hit people who are weaker than them are subhuman." As in, not fully developed human beings in the larger sense.
As a believer in equal rights for both genders, I believe in equal responsibilities to. A man shouldn't have to "take it" if a woman hits him. He should defend himself just as he would if a man was hitting him. In most cases that would be to walk away; once you're beyond their reach, they can't hit you. If they follow after you and you cannot walk away, and you cannot defuse the situation by talking, you clobber them, be they man or woman.