Do you think a man ever has the right to hit back when a woman assaults him?
I don't think he should respond disproportionately : i.e., if she slaps him, he shouldn't slug her. But if she slaps him first, she has no complaint if he slaps her back.
Obviously the idea of teaching men to be inhibited against hitting women makes a lot of sense given their far greater strength. But I think the idea that a man has no right under any circumstances to strike back encourages abusive women. Worldwide research shows women initiate domestic violence more often than men.