I think the most hated literary work I've ever had to read was not a book, per say, but a short story. Think it was called
Coming of Age, or some other banol nonsense. Don't remember who the author was, don't care. It was about some young boy who looks up to his older brother, a soldier who has recently gone to Vietnam coming to terms with the fact that said brother has died. It's one thing to plod through a story that is absolutely boring. It's another when you find the material downright insulting. For page, after page,
after page, the prose drones on with this kid being too [censored] stupid to realize what the [censored] "missing in action" entails, and what the [censored] death really is. Yes, I said [censored] three times, my hatred for this story runs that deep. The author really didn't seem to understand children
at all, or if he did and was just putting us into the head of a particularly slow one, then reading it was just as frustrating an experience as actually dealing with such a person.
The Oddyssey I've read epic poetry for fun. I've enjoyed it. I don't have a problem with the format. What I have a problem with, is Homer's horrible writing style, and the flatness of the characters. There were precisely two sections that I enjoyed reading: The Spartan King's recollection of his wrestling match with Proteus (because, I realized, that meant he could out-wrestle a man who could become fire) and the slaughter of the suitors (because, I realized, Odysseus strips naked when he assumes his natural form, and then never puts any new clothes on, so the entire time, he must just be awkwardly naked)
To be fair, the writing style's not necessarily Homer's fault, but the translator's. Poetry never survives the translation process.

And hell, it's likely not even meant to be a story that you read, but one that you hear recited.
All of the Holocaust books I had to read earned my ire. It's remarkable that we've managed to take the stunning, inconceivable atrocity of the Holocaust, and transform it into a dull cliched genre of literature that we force on young children who can't even comprehend what tragedy is.
Heh, that, or an easy way for a filmmaker to win an Oscar. And I kinda' have a similar opinion on the Civil Rights Movement, and the prejudice blacks have faced throughout American history. Had to go through a number of books on that subject. After reading
I Know Why the Caged Bird Sings, I finally snapped, and carved Maya Angelou's name on a chainsaw.
The point of "making" you read a bunch of books is to help you find books you like. While maybe it doesn't apply to you, a good many people wouldn't pick up a bunch of the classics if it wasn't mandatory reading (or any book for that matter...).
Regardless of how important reading classics are, people don't need to like them.