When I hear of an incident like that, I can't help wondering if the person approaching the 'rude' celeb might have come across as over familiar or taking the mickey, as well as if they are exaggerating the degree of rudeness of the celeb.
I can totally see where you're coming from but in this case it would be a "no".
Doog is one of the nicest guys you could meet. He's an army bandsman and is an accomplished folk musician as well. He and his severely physically disabled wife are big fans of MM and have been to see him live a couple of times and he approached him to tell him how "great" he thought he was and this was the response he got.
He said everyone else was top notch, MM stuck out like a sore thumb with his snotty attitude.