Honestly, that's just dumb. I've seen it pop up a few times on this board, some people advocating it even when they themselves were part of the group rooting for a team who's school they did not attend and it's such a silly point of view.
There are just so many things wrong with that line of thinking. So if you have kids, and they get into football and pick a favorite, you're gonna tell them how lame it is that they are rooting for a team who's school they didn't attend? What the hell? Did you not root for UCLA growing up or did you just wait til' you went there to root for them?
What if a kid grows up rooting for their home team, but decides to go to another college that they feel is better for them education wise? They're lame because they want to root for their home team? Maybe they just don't want to go to a specific school to have the right to root for that school's team. Maybe they didn't get accepted into the school and had to go elsewhere, should they drop that team as their favorite in that case? What if the school they went to didn't even have a football team?
Where does it end? So what about pro teams, is it lame for a person to root for a team that isn't a representative of their city/state? Since when was it lame to pick a favorite anything?
Also, as for the "we" thing. Why do some people make such a big deal about this? I'm guessing it's due to some talk show host bringing it up one slow news day and the flock ran with it. It's not a big deal.