[smsm42]

I think there are ways between "ignoring it completely" and "unperson anybody who isn't perfectly polite", and there are ways to provide feedback to people about them interacting in a bad manner without exiling them. I think most people would be amenable to such training - just as they learn other social norms. If the professor's management would be willing to employ such training - without choosing between "ignore it" and "lose the professor" - I think many douchebags would learn to keep their douchebaggery in check. Of course, it may require some effort from the management side...