When I was a kid going to the games with my grandfather, him and my grandmother were always trying to cover our ears and trying to keep us from looking at the other people in the stadium. I agree, they can be a douchebag bunch of people. Pissing in the sinks and floor drains, cheering because Michael Irvin was hurt, not that he was coming off the field, toddlers wearing "Fuck Dallas" shirts, etc. I saw a guy and his kid that had to be 10-12 years old have beer thrown at them and the dad got beat up because they were wearing Redskins jerseys to the game. They took the dad and kid out and did nothing to the douchebags that started shit.
You can't help which team you grow up liking. But I agree, they are a shithead bunch of people.