I used to join soccer matches as a paramedic and I never understood the rivalries. I guess because I mostly paid attention to the worst offenders since that's where we would be called to or that we have to wear helmets during specific matchups.

But I think I just never paid attention to friendly and funny banter. I guess people throwing bottles 'n stuff just totally alienated me from people just being fans of a team "for fun", lol

That would at least make a lot of sense, now that I think about it.

Edit: damn, already learned a second thing, haha