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?
This question is stupid. Liking certain things isn’t a red flag that someonenis a bad person. Sure, people can be edgelords and have messed up interpretations of certain books and films, but they’re few and far between so I don’t really care. What’s more common is that I find fans of certain books/series annoying (e.g. harry potter adults), but being annoying doesn’t make someone a bad person, they’re just obnoxious.