I dislike crowds.
I dislike live music.
I dislike loud music.
I dislike loud, live music.
I dislike a bunch of drunks.
I dislike trying to decide which of several obnoxious bands to listen to at any one time.
And most of all, I can't stand jazz, not that there is much of that anymore at Jazz Fest.

But hey, besides all that, I hear it is really a fun time.