edit: These are two points of view that often clash in the world of football. The hatred all over my country of Manchester United fans is based on pretty much the same thing. Man U fans probably just want to watch the best team play, but usually people's team are their closest decent local team (or are team that has been 'passed down' through generations of a family). This leads to a surprisingly huge amount of resentment, but i honestly think the whole thing is based on this two ways of looking at sport.
I know that sentiment when the local team beats their bigger nemesis. The problem is that emotional involvement in such things also can make you angry. When I go to the local football team's games, I have a blast watching people rage because of the score. That's why I consider rooting for some player or team irrational: you basically watch an event and get angry or joy, having no control over it at all. That's why I made the post about hyping games up and everything.
Anyway, seems like when we started talking rationally, everyone got quiet. It's probably the bad place for this kind of talk, so have a good night.