The reaction is clearly not the same no matter how bad the violence is. A clip of a woman senselessly beating a man would've never made it on this subreddit. A scene where a woman purposely pissed a man off and the man wanted to slap (not beat) her would indeed have a harder time making it on here but that's not what you said.
You compared people not minding an attempted slap from a woman to a man 1.5x her size to people not caring about women stabbing men which is a bizarre and totally unfounded comparison.
I wouldn't bat an eye if a women slapped a mate of mine like that because he was being a dick, but i'd never let them get stabbed for no reason lmao. Those are completely diffrent scenarios.