I just remain loyal to my hometown professional teams, with the exception of football. So, it would be the Lakers (NBA) and the Dodgers (MLB). The absence of professional football in Los Angeles, coinciding with my absence, led me to abandon any childhood/teen loyalties, so I now consider myself a Seattle Seahawks fan.
In a Super Bowl like the recent one, where I have no opinion on the teams, I don't care who wins. The same would have been true with Chicago and Indianapolis in 2007. Who gives a rat's ass? I was on the hillsides of the Golden Gate Bridge with thousands of others watching the QM2 sail under the bridge with a slim margin and into the bay for the first and only time thus far. Most Super Bowl memories blend together over the years. San Francisco on February 4, 2007 doesn't fade.
As far as college football goes, I don't like UCLA, USC, or Cal Berkeley. I would have not liked going to any of these schools. The same would hold true for Notre Dame. That would have been like pulling teeth. When it comes to Pac 10/12, I am a Huskies fan, for obvious reasons. That has led me to dislike Oregon. I have no loyalties from a past (tense) "Big 10" "experience," which was even more of a teeth puller.
If you've moved a time or two, you'll run into locals who have never moved. They may know nothing outside of a 125 mile radius. You might encounter such a local who acts like the late Marge Schott or a Bubba (possibly under the umbrella of the "basket of deplorables") who asks you, out of the side of their mouth, of course, "How about dem (insert name of local team)?" It doesn't go over well that you don't give a shit because you have deep roots somewhere else and your loyalties won't be changing. You should see the completely disoriented looks on their faces.