I gather there's been a little excitement recently in Brazil.
My Better Half grew up a Cubs fan (one with 90% scar tissue, as George Will said), though she's learned to root for the Brewers. Some of the rest of the clan work up some desultory enthusiasm for the Packers if they do well, but mostly wait until SuperBowl parties to watch anything. Middle Daughter has been watching events from Brazil, though.
I didn't grow up in the US, but I think my lack of connection to sports is more temperament than environment. I can get involved enough in a softball or basketball or football or ultimate Frisbee game if I'm playing (Less than mediocre in all of them, though), or stay interested if I know somebody on the field, but otherwise I have to work to pay attention. I've a vague home team loyalty, of the "I hope the team my friends like wins" sort.
I used to have a kind of snobbish superiority about that: "I'm above such trivia." "I am the cat who walks by himself, and all places are alike to me."
But sports enthusiasm gets people involved with each other, cheering for something together, joining in some facsimile of community. That's not a trivial thing when almost all other amusements isolate/atomize us: slouching in a seat watching cat videos or playing Angry Bird, or headphone-isolated into your own playlist. And we move around so much that no place is quite home (cosmopolitan=homeless); except for the place the home team has in the heart. We need something to bond us--sports are better than nothing (at least until we go all Blues and Greens). Not a very profound bond, but not nothing, mixing the generations in a way that even churches often don't.
I don't disparage sports anymore (I try not to, anyway), though I haven't tried to work up an interest in them yet.