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 don’t really mind, but don’t need the intimate details. People talking about it is better than having it be secret and shameful, and is something going on in the person’s life, but say what you need to and move on!