A situation like that easily makes sense to me. The girls came to the game looking for attention. They got the attention in the form of a simple boo, they reacted negatively, and then they were probably a little embaressed for escalating a simple boo to a middle finger. They then took off or simply moved seats so that the entire section that witnessed them acting like utes wouldn't be on top of them or judging them the rest of the game. As a teen or college student I let things escalate in situations faster than I wished I had in retrospect. I bet the girls were/ are good girls just got caught up in the moment. It's happened to me. There, an easy explanation that could explain it all. you can choose to believe it or you can choose to continue to think the original poster is a liar.