It's a story with a good message

A guy was sitting at a bar one night. One of those dive bars where you make love to your booze and shut up. A guy in some punk clothes walks in and sits down, before he gets to say a word the bartender turns to him and says "No. Get out." The punk argues that he isn't doing anything, he's a paying customer. Bartender reaches for something under the counter and repeats himself "Out, now" and the punk leaves.

First guy turns to the bartender and asks what that was about. Bartender explains that he had Nazi shit all over his vest, iron crosses and other shit. Says you start to recognize them. It starts out nice enough, one guy comes in, he's polite and nice, so you serve him because you don't want to cause a scene, then he comes back with a friend or two, and they're fine, too. But then they bring their friends and it stops being cool all of a sudden and you realize "oh shit, this is a Nazi bar, now" when they take over. It's too late to try and kick them out at that point because they will make it a problem if you try. So you have to nip it early with the first guy no matter how reasonable he seems because the end goal of that guy and his friends is to make it a Nazi bar for him and his cohort of Nazis.