There's an article over at ESPN on UofM recruits fraternizing with Ohio recruits at The Opening. (LINK: http://espn.go.com/college-sports/recruiting/football/story/_/id/8143990/michigan-ohio-state-rivalry-put-hold-opening)
Really, just a piece of fluff. But as I think about this, it just goes to who people are. If someone is cool and you get along with them, it doesn't matter what school they go to, or will go to, or went to. The flip side is true: just because someone is at Michigan doesn't automatically mean that you're going to be friends.
I remember several Michigan athletes who were jerks. And also have known some from other schools who were good guys. You never know.