It's not acceptable
But there is an argument, mainly seen on mn that that it worse for men to hit women, because men are stronger and will do more damage and inflict more fear. Because power is balanced in the male favour, it's very different and that a woman slapping a man isnt great, but mo where near as bad
What this argument doewnt take into account is abusive women. A relative of mine was far stronger than his wife, but was brought up that you never hit women. Which is a good thing. However, because she knew this she used against him she had the power. She hospitalised him several times. The last time, she repeatedly punched him in the back of his head and he has scars. At the hospital, I over heard her adult son say 'if anyone calls the police, say he hit you first'.
She had power because she knew he had far more chance of being arrested on DV charges that she did.
Same women also claimed her neighbour attacked her. Except there was CCTV and she clearly jumped the neighbour. Claiming self defense was a ploy.
She had the power, because she was certain he wouldnt hit her back, even to defend himself. Also the shame, humiliation and emotional pain (that someone you love would do this to you) are the same for all victims, male or female. This damages self esteem, mental health etc.
Power doesnt always come from being stronger
I would also say that on MN there are a lot of people that will claim women who hit their partners have been goaded and abused until they snap. But men cant every have been goaded or abused until they snap.