How do you deal with conflictive people at concerts?

Etiquette needed for cultural events is a little different from everyday behavior. There are some things you do and don't do during concerts, sporting events, and all sorts of public gatherings. Expert concertgoers know what I'm talking. Even so, now and then, some entitled people come to break the rules of politeness and disturb the peace altogether. These following stories, share some internet experience on the matter. 

In this story, an internet person complains about an unexpected interaction with a horrible Karen during a concert. The family was attending a concert but got there a bit late under normal circumstances. Because of that, a group of people thought they had the right to take their seats. After it was all sorted out with one of the ushers,  a couple of them still came back to try to steal the seats again and, once more, were kicked out. They did move, but of course, they maintained their entitled attitude till the very end.