Ah yes, I forgot we're westerners... money is the solution to every problem around these parts, right?
I get what you're saying, and yes... they SHOULD be nice to people (after all, if it weren't for their fans, they would be nobodies), I'm simply saying that they are under no obligation to do so, and if they choose to be asses (like many do), we shouldn't let it influence our professional opinion of them. Am I happy that Atkinson is consistently a self entitled jerk every time I have to deal with him at work (I work part time as a concierge in a cinema in Hampstead, London, an area that's packed with artists and celebrities)? No. But neither does it have any influence on what I think of the man.
On the other hand, it is always nice when Hayley Atwell or Sacha Baron Cohen drop by as I always have a laugh with them (she's a massive flirt, sue me for liking it). But that doesn't make them better people than Atkinson, they're just different.
This is absolutely ludicrous. Celebrity or not, we should be nice when someone says hello to us. This is just being a decent human being. And no, they're under no obligation to do so. But to suggest you shouldn't view their work differently is a little naive. Hell, if someone is a dick at work I appreciate their contributions less. The same should apply to everyone. If you're a dick, it absolutely affects how people see your work.