At first I thought this story was going to be really out there, but after reading, it makes total sense.  Renee Zellweger has a thing for rude people.  She loves them!  So if you ever meet her, blow her off, it might make a good impression :)
"I know that sounds so crazy, but I really cherish it when someone is mean, because they're just having a bad day and they don't recognise that you know Tom Cruise, and so they don't alter their behavior in any way. I love it. I love it when the stewardess is just nasty." But Zellweger hates it when people suddenly realize who she is and start pretending to be nice - as it always seems so fake." She adds, "I just cringe when she (the stewardess) comes back and apologizes because she didn't realize."