If I wanted to like every team in the league, I could if I wanted to. But picking a team and calling myself a fan of that team is fun for me. So this year, I've added a twist. I have an AFC team (Raiders) and an NFC team (Bears). I was going to root for the Bills too, but I think their GM or some top exec dissed the Raiders and I wasn't cool with that.
I didn't grow just liking one team though, back in the 80's I used to like the Raiders, 49ers, Dolphins, Seahawks. That's just me. That's why I'm so deep in football today.
What's funny is my 13 year old son is the same way. He's smashing folks on Madden (360) and the older homies he's smashin' keeps calling him a bandwagon fan. He's using the Ravens and they're getting on him because they said he wasn't a Ravens fan a few years ago. I tell him to use any team you like and be yourself and he shouldn't care what people say about him.
I guess we got it from my pops. He likes both teams from NY. But he said he'll leave them if they start losing too much.