I was just making fun of my GF the other day based on this. We watched a YT video featuring Aaron Rogers, who is the QB for the Green Bay Packers. She, being a Chicago Bears fan, ranted for a bit about how much she disliked him. I retorted with "You don't dislike him, you dislike his uniform. If he was traded tomorrow to Chicago, you'd be routing for him." Any activity that divides humans into tribal factions is outdated neuro-programming, in my opinion.