"Seriously that's such a stupid and outdated concept. Alot of women are more than capable of kicking a man's ass. It's not like just because she's female that she is a helpless person who can't fight. "
it is not a matter of what the woman can or cannot do, but of a weakness in character of a man who is willing to do so.
I think that that is precisely the outdated concept he's referring to. I mean, if I'm threatened with bodily harm, and the way to avoind injury is to fight, then I will fight, no matter who my opponent is. Saying that hitting a woman in self-defense is wrong, or that hitting a woman for something is worse than hitting a man for the same thing, is akin to saying that hitting a caucasian is less/more wrong than hitting a black person or an Aboriginal.
Now, in some circumstances, there are men who will hit a woman because she is a woman, and in those cases, you have a point.