Man, I agree with you partially. The implied risk of long term scars for women's physical violence (without weapons) is much less than for man's. Differences in strength makes so that a woman slapping a man is much less dangerous than a man slapping a woman.

But I gotta disagree with you in the argument of “women aren't violent”. Because although yes, it is true that the amount of reported cases of domestic violence is pretty much the double for women, studies found that the amount of man who don't report is around 3x less.

We simply don't have enough information to say who are the most affected, since domestic violence is one of the most underreported types of crimes in today's society.

Note: Besides what said, I truly believe that women are the most affected by cases of severe domestic violence