I’ll go with the low-hanging fruit: Mein Kampf. I’ve read it, cover to cover. As a piece of propaganda, it’s good. As an example of good writing? Absolutely not (though I will admit I have only read it in translation). Oh, and the whole fascist, racist, and generally shitty worldview of the author that he infuses into the text. And the fact that the author is literally Hitler. You 5-star that book? You’re a Nazi. Period. And as a Jewish person, I don’t look too kindly on them.
I know a teen that absolutely LOVES Ready Player 2. Talks about it constantly. I didn’t have the heart to tell the kid that they probably need to tone it down a bit.
I’ll forgive teenagers a bit tbh, I loved some questionable shit as a kid. Its the adults that bug me, like you can like things that’s fine but if you’re gunna name that as your favorite book ima need you to engage some critical thinking