I'll start by saying that I've seen both the Grateful Dead (three times) and Jimmy Buffett (two times) and had a great time at the concerts. And I've always had fun in the parking lot. PAAARRR-TAAAYY!
With that said, both hardcore Dead Heads and Parrot Heads annoy the hell out of me. The whole "look at me! I'm embracing this and I'm a part of the scene!" just gives me a major rash. And I hate self proclaimed Deadheads or Parrot Heads that have to let you know, "I'm a total parrot head. I've been to 21 shows. I know every song." I don't give a s*%t buddy. So who is more annoying and why? Show your work.
Also, bonus points if you can name any other band follower names. By the way followers of Clay Aiken are called "Clay Nation."
(Look at that dude above. Arrogant nerd!)