I had an old college friend who thought I read too much genera fiction and I couldn't see what appealed to her about contemporary mainstream fiction. Years back, we agreed to pick out a book for each other to see what the deal was, or if either of us would change our opinion. I gave her Silverlock, (which I thought would appeal to a literature major) and she gave me The World According To Garp.
I have read things I didn't enjoy, and things I actively disliked, but once I was through them it was over. To this day, Garp is the single book I have ever read that I would go back and unread if I could.
It turned out that my friend never read it either, nor did she read the one I sent her.
That's as close to fisticuffs as I have ever come over fiction.
Do you have a book that you'd unread if you could?