The biggest one I can think of is The Catcher in the Rye. It is a good book, and if someone likes The Catcher in the Rye it means they are well-read. If someone says it is their favorite book then they probably identify with it too much and missed the point.
What are some other examples of this that you know of?
Unless your favorite book is like Mein Keimpf or something I think it’s shitty to judge. I remember I was reading the Host by Stephenie Meyer once at the pool and my brother was like don’t you want to hide that cover ? No, this book is entertaining and that’s why I’m reading it. It doesn’t say anything beyond that. Maybe someone’s favorite book is just something that really struck them at the time, or has some theme that specifically resonates with them. No need to judge!
Maybe thus spake Zarathustra then. Just based on the contribution it made to mein kampf