There's nothing "fairweather" about cheering for the school you actually attend.
I love the argument "well, what if you were a Hawkeye fan as a kid? You can't just change your allegiances because you wanted to be an engineer." When I was a little kid, I used to **** my pants and think girls were icky. Was I supposed to stay an incontinent asexual for the rest of my life, or was I supposed to grow and adapt?
I hear ya, and I'd be lying if I didn't think the last two sentences were really funny, cuz they are. Kudos. But I do think there is a difference from being in 8th grade (having a mind of your own) compared to not being able to decipher that peeing yourself isn't as cool as using that big porcelain thing or that boobies are totally awesome.