An author that you completely avoid/hate wont read.
I can't think of one, I'm pretty open when it comes giving authors the benefit of the doubt. If I didn't like one of their books, the next one might be better.
Same for me really, I don't usually dislike books because of their genre or author. How much I like the story is pretty much solely based on how good the story itself is and just because an author might have a book I didn't like doesn't mean they don't have others that I might really like. Every story is unique, it's unfair to rule out all the works of one author I think.