Eh, it might say more about the guy than anything. I have had women hit on me and I used to wrestle women competitively, I personally could never feel threatened unless it were a Cris Cyborg coming for my head but if you genuinely feel like you are in danger, do what needs to be done to end that danger. 100%, women should not be putting hands on any man, and you should immediately cut ties with any woman that takes it to that level but from a defensive standpoint, most women grabbing or hitting me has always felt like a child doing it, so I either de-escalate or walk away entirely.
And to be clear there is no justification for a women to assault you unprovoked (physically), but for the response, it is going to be on a case by case basis, of course the law will interpret the power dynamics in play but personally it is up to each individual's discretion, if the man truly feels in danger he should defend himself and is doing so ethically if he can't either evade or de-escalate the situation. That's my most unbiased take, my previous take will be biased due to my physical experiences with women, if your experiences have been with women throwing legit haymakers and trying to take your head off, I would expect you to have a different outlook on the matter.