It has everything to do with it. No idea why anyone would support a club based in a city they've never even visited, let alone lived in. It's a mystery to me. Each to their own, though, I guess. To me, it's about community and civic pride and family (every time anything significant happens with United, I think of my grandad, a diehard Mancunian Red who died far too young). The stories my uncles and my mom told me about the Busby Babes, about Munich, about how it felt to be in Piccadilly Gardens when the newspapers blared the awful headlines, about redemption ten years later against Benfica, about crying as a kid when we were relegated then celebrating our return to exciting wing play under the Doc. And on a more mundane level, about getting on that bus every other Saturday to cross South Manchester to Old Trafford and pay my two quid at the Stretford End turnstiles.
I realize not everyone was fortunate enough to experience all of this, and that's fine, but this is why I won't call out any players, let alone fellow Mancs who play for United, period. You call it "tosh" (which is astonishingly disrespectful, frankly); I call it what it feels like to be a lifelong United fan born in that great city to a family who lived and breathed the club.