I'm not sure that's the point of the comment though. Maybe it is, idk.
I guess we fundamentally agree and just interpret the comment differently. Hitting others is generally not ok, except in self defense.
I interpret the comment as "The boy should learn some self defense. That will help him get over the abuse and recover some self esteem.", which I find valid.
You interpret it as "The boy should start hitting girls. This domination will lift his self esteem". I agree that's a shit take, but again, I also don't interpret the comment that way, and I don't think that those who upvoted it do.
I guess only OP can clarify what they meant.