Pro tip that works well: if someone says something offensive, ask them to repeat it. "Sorry, what did you say there?" Act real dumb and say you don't get it. "What did you mean by that?" Having to explain is often enough to confront them with their own behaviour
I would like to see more men talking about how to and peer pressuring each other into calling out misogyny and rape culture. Going against social norms is hard, and it helps to share tips and support.