While Sundance Film Festival is a major economic event for Park City, UT, there will always be some people who need to take jabs at it. I’ve heard of two somewhat funny pejoratives for festival-goers: “PIBs”, which stands for People In Black (go to any film event and you’ll understand); and “Festers.”
A couple years ago I made a button with a picture of Uncle Fester on it and the words, “I’m a Fester,” but I think it was too small for people to notice.