I'm kind of with @South Austin I've been thinking about this topic lately and I'm not exactly sure why. I think part of it is getting older and having other responsibilities but for me part of it was also probably the whole Covid thing and also nil. I support NIL but there is no question it is further distancing me from my sports fandom.
I care about Michigan State sports primarily because I went to school there, graduated from there, met my wife and lifelong friends there, shared classes and shots and house parties with athletes and coaches etc. I've always had a healthy respect for the fact that this is a school that l attended and I love those colors because of it and you share the love of that school and those colors and thus I find it healthy to root for that. Probably a bit naive but I could always find a way to get back to that place in my head. Now it's nearly impossible.
So that said I follow MSU football and basketball (tied) year round. I watch all of the games that I can, follow recruiting somewhat casually. But ultimately the highs aren't as high and the lows aren't as low anymore. I remember wasting entire Saturdays in the early 00s brooding because we lost to Rutgers. Now I laugh and basically give zero fucks..
I casually follow the Detroit Tigers mostly because of childhood memories and there isn't shit else to do in the summer.
I don't have a rooting interest in a NFL team other than who I am betting on.
In NFL and NBA I like to watch teams with guys whose careers I watched at Michigan State. I have developed casual rooting interests in some of these teams after watching them for years but I don't bat an eye if they win or lose. I like to watch the Hornets, Grizzlies and Warriors in NBA which is far and away my favorite league right now despite no real rooting interests.
If the Red Wings ever get good again I will probably casually watch and root for them.
I'm interested in the Pistons rebuild because I think Cade Cunningham might really be special but I don't see myself ever really becoming a fan again.
Man getting old is kind of depressing.