If a woman slaps a man without justification, is it ok for him to hit her back?

I just saw a video of a woman slapping a US Navy sailor because she mistakenly believed he was engaging in stolen valor. He didn’t retaliate with violence, but it raised the question, would hitting her back been a justifiable act (morally/legally/culturally)? or is the “men should never hit a woman” thing always in effect no matter what? Why or why not?

I’m curious what both men and women think about this.