All due respect but...One man's a-----e, is another man's hero. (see; Boeheim, James Arthur)
JMHO, but I doubt there would be this much whining about Petrino, if the aforementioned azz-whuppin' shoe was on the other foot.
Its a common trait of a losing fanbase to start talking about what a scuzz ball the opposing coach is/was, as a way to mitigate defeat at the hands of said "scuzz ball" and his team. Personally, I'm always amused by this as, again IMHO, it adds nothing to the issue at hand.
I don't have to trust Dixon, Petrino, Schiano, et al with my money, or go out to dinner with them. My only interaction with them has been when they've faced off against my beloved alma mater. I don't know them personally and can't make such a judgement with the little facts I have available to me. If they're really all jerks, I let their own schools and their own fans deal with it.
Anything else is totally beside the point, IMO.