Definitely don't stand in your seat. I report those assholes too. I was at Maroon 5 on the floor, and the person in front of me let their kid stand on their chair and that made the kid about 7 feet tall. I politely asked the parents to get their kid down, and they said "Oh, well they can't see if they are on the floor" and I said, "I don't care, I can't see if they are on the chair, and I will get security." They took their kids down. Standing on your chair is JUST as obnoxious. Get better seats. I hate that people think like you do. It's not okay to just go in front of someone else. Why do people think that they are more important than someone who paid for their seat? You don't deserve special treatment.