Enough is enough

It's not right when good people are taken advantage of! I heard a story that pissed me off. She was in a restaurant and realized that she was being overcharged, but wasn't trying to be rude she was just letting them know because accidents happen. But he obviously did it on purpose because he thought he was called out so he started making an ass out of himself by name calling, for no reason! I have coworkers doing the same thing, but if I call them out I'm the asshole who's going to be attacked. So do I say nothing until I move on to a new job or do I risk being attacked?