Oh yeah, self defence completely applies there.
One side issue is the closed fist / open hand distinction. That line of thinking applied to women seems to lead to some edge cases where you can slap a bitch but you can't beat her because that would be horribly wrong. It sounds to me like the key thing that lets you defend yourself in that situation is the shape of her hand and that's just incredibly narrow and formalistic for responding to an attack.
Really?!?! If she acts like a man, get the hell out of there! Go find a women. There's absolutely no reasonable excuse for violence against women. Remove your self from the situation before it escalates to that point. It's a sorrowful excuse for a man who would maintain such a toxic relationship.
And what about when she acts normal, sometimes bitchy, but otherwise acts female, all the way up until the moment she attempts to kill you? Would that be a reasonable excuse for violence against women?
If she's trying to kill you, what noble sentiments are worth dying for?
Not that one... I landed the spine of a textbook upside her head so I could get out the door....
You would've had to ignored red flags in the past that hinted towards violent tendencies. If some crazed bitch pointed a gun at me, and death was eminent, my first reaction wouldn't be to punch her in the face. I'd have a better chance by grabbing the weapon and securing it...Then I'd leave.