It used to crack me up when I went to college, and everyone from Indiana north of I-70 was trying to glom onto Chicago so they wouldn't be identified as hayseeds by the many Indiana students from the East Coast.
"So, where you from?" "I'm from this suburb of Chicago. Plymouth. Ever heard of it?" Of course, the same people would try to insinuate that Indianapolis was a little insignificant cowtown in the middle of the state to further the point.
Of course, I'd quickly point out that their town was in the middle of a cornfield 100+ miles from Chicago and closer to Fort Wayne than any other decent-sized city, kind of blowing a hole in the whole "suburb of Chicago" thing.
Really, the gist of all of these stories is that the issue between Colts/Bears fans lies isn't necessarily in the current generation, but from those that are 40+. Indy was a Bears (and, for some weird reason, Dolphins/Cowboys) town before 1984. And, at late as the mid-1990s, there were still as many Bears/Dolphins/Cowboys fans as there were Colts fans in the city. If you're 40+, it's likely you grew up following someone besides the Colts. And, if you live outside of Indy metro, it's likely you still follow that team.