For me it’s detailed describtions about people’s dreams.
Not only doesn’t your story make any sense, but you’re also telling me about something that didn’t even happen. It’s kind of like telling about an event, and then ending the story by saying you just made it all up, except with dreams you begin by telling it’s all made up. I’m already not interested before you even started.
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I think there are two types of people who describe dreams: 1) Those who are essentially saying, “Listen to this absurdity, isn’t it hilarious/weird?” and 2) those who are trying to pick up insights and think their dreams mean something. It’s the difference between reading a fantasy novel that is all about characters, world building, and a cool story, and a fantasy novel where the author is trying to make some point about the real world and how something should or should not be.
I definitely fall in line with OP’s sentiments about that second category.