Rich has almost no sense of public relations, or how his words are going to be perceived by the outer world, most especially his detractors. Or he doesn't care.
Going to his comment itself, I have no doubt whatsoever that his assessment of entitled players is accurate. You do not lose to Appy State in 2007 without having some element on the team believing their shit didn't stink, and he inherited however many players still on the team in 2008 with that attitude.
The problem is that making anything other than positive comments about his experience at Michigan yields absolutely no benefit for him. He didn't need to reference Michigan when commenting about the buy-in he was getting at AZ.