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.
I really just can’t stand talking about other people, places or events when that’s all someone talks about.
I’ve met and spent days with countless people like that here in Southern California; any original thought is off the table and I always think “well eventually they might open up or something” but no, it just doesn’t happen.