Late to this thread, I'm having trouble thinking of any books I really hated, but then recollected a couple that I found so annoying I put them down unfinished. To be hateful a book has to be worse than just dull or not to my taste. I've never been compulsive or guilt-ridden about setting aside a book if I just lose interest in it. But some get put down with a bang, for other reasons.
One of those was J.P.Donleavy's The Ginger Man. Supposed to be a classic, I know, but I found the central character so irritatingly irresponsible in a selfish and nasty way, while it was obvious from the tone of the writing that he was being celebrated, that I quit fairly early into it.
I don't mind a flawed protagonist, or even a crazy one - I had no such difficulty with Confederacy of Dunces, for example. But Donleavy just rubbed me the wrong way.
Another author who rubs me the wrong way, to whom I even gave two chances, was Robert Coover. I tried The Public Burning, which was well reviewed, and seemed like a really good idea at the time, considering the degree to which I loathed Richard Nixon. The problem was that he mixed fiction and history in such a way that I found it terribly annoying having to try to sort it out. Of course that's a part of his point, but to me the facts in Nixon's history were too truly important to fool with, and I was continually sidetracked trying to determine which parts were made up and which not. So I dropped it. I gave Coover another chance with his short story collection Pricksongs and Descants, and he pulled the same kind of post-modern trick again, with a story in which he kept changing the account of a series of incidents. I found myself practically screaming "but what really happened?" and realized that this was Coover's point again: that nothing "really" happened, because it's fiction. It was a kind of authorial "gotcha" that struck me as insulting to the reader and to the art of fiction. Other so-called post-modern writers like John Barth play around with fiction in a self-referential show-offy way, but when they do it, they seem to be saying something like "wow, this is fiction! Isn't it cool?" When Coover does it, he seems to be saying, "It's just fiction, sucker." To hell with that. At some point when I was selling surplus books I sold Coover off with no regret.