Actually, if you're "old school", then you'd have no problem popping a woman who'd just punched you. I'm 56, and when I was Hyde's age the thought of a woman punching a man unprovoked in a bar was inconceivable...but if she did, then there was no problem in her getting hit back because she asked for it (now waits for someone to dig up the lame comparison of the old argument that a woman couldn't be raped if she wore suggestive clothing "because she was asking for it").
[censored] "moral distinctions". Women cried for decades for equality, and if they want it they should expect to be treated equally if they start going around physically assaulting people. Do you really think that women can go around punching men and be exempt from retaliation just because they're female?
As you know, I live in Hawaii. They are a lot of big-assed local gals here. What if a 6', 200+lb Samoan gal took a swing at me because I wouldn't dance with her, or buy her a drink, or whatever? Now what if some 5'6", 150 lb drunk dude got all brave and wanted to hit me? By your "moral compass", it would be wrong for me to strike the Samoan gal back, but OK for me to flat out beat the [Mark May] of the guy, even though the Samoan gal would probably wipe the floor with the smaller dude if they got into it.