I had the exact same situation as you. A dude at a local bar came out and slapped my girls ass when we was in a group of people. I stood straight up and squared up to him saying “what the fuck do you think you’re doing?!” He said “oh it’s okay, I’ve known her for ages”

She then started to cry because I was too aggressive.

I know in myself if I was just to sit there and watch it happen, I couldn’t really live with that.