This particular case is about a man who slapped a woman down after she spit in his face and kicked him. According to witnesses, she was the aggressor. In court, the prosecutor asked him is it ever ok to hit a woman, he said in that case, yes.
In my opinion, I have to agree with him. If a woman wants to act like a man, she can get treated like one, and when such treatment comes, they shouldn't play the "i'm a woman" card. And then some women are just huge and strong. I remember at this one job I worked at, it was a woman (who was a dike) that was 275 pounds at like 5'11 or 6'0. And it wasn't that flabby kind of weight. It was that solid weight. She dressed like a guy and had masculine mannerisms. Her 2nd part time job was being a bouncer. She claimed to be able to bench press 315 pounds, which looking at her, I don't think is too far fetched.
In her case, I think it would be perfectly acceptable to hit a woman. She could easily hurt a grown man with her bare fists. But in general, I think it's a case by case basis.