I've been somewhat disgusted by what I've read in some books, but offended would not really be the right word for me. I bought and read a book about the KKK, for instance, when I was in my early 20's. Many members of that organization agreed to be quoted, and let the author hang out with them.
The only book I ever destroyed and threw away was written by tabita king. It was awful about houses.
No book has ever offended me...but maybe "Mein Kampf" might do so if I ever decide to read it.
I can't think of one.