No, just being a fan of another team does not get an automatic banning. Fans of other programs probably get shorter leashes, especially if they are over here to cause trouble. I don’t know who your friend is, but he may have gotten taken out when there was a wave of posters who have come over here to start crap. There have been times when we have been overwhelmed by fans from other boards and we have taken out a bunch of them. We are short handed here at times. Then, if he/she came back under a different name, we can tell and will usually ban that name too.
I don’t have an issue if an opposing fan comes here to debate, but if they can’t do it in a civil manner, they probably won’t be here long. I can’t speak for other mods, but that’s how I do it.