I think it's perfectly fine to trust other people's opinions and form your own views without reading/seeing something - otherwise you'd never be able to make any decisions about what to read/see.
I have opinions about, say Twilight and 50 Shades of Grey which I haven't read, and because of my received opinions don't want to read. I even have opinions about the healthiness of the relationships they propound, which is maybe shakier ground, but I'd probably bring it up in some circumstances.
What is never correct is mob-based abusive action. Probably not even if it is justified by the facts and you have read the book.
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