For me, JD Salinger.
He makes me cringe. I've had to read a couple, and each page I read just makes me want to haul him out of his seclusion for a public flogging.
In Catcher in the Rye, I wanted to beat the hell out of Holden, for having such a worthless and mushy outlook on everything. That guy needed to find a clue. It was a book about nothing. Worse, my English teacher at the time was in love with the character. Jesus, did she need to get a life, too.
Anyway, years after reading it, it still gets on my nerves.
Who else has a pet peeve author?