When someone displays inappropriate behavior today, it should not be tolerated by you or anyone else. Be the first one to call foul when an insult is hurled or a shot is aimed below the belt. Whether you're defending someone else or defending yourself, go at the perpetrator with equal vigor. Right now you have more influence in your group than you might realize, and when you draw attention to a trouble maker, they will get their comeuppance in one way or another.