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.
The dose makes the poison.
For me, excessive self aggrandizing stories are unbearable. Everybody has a story about themselves where they are the hero, or did the amazing thing. That’s perfectly fine, and in reasonable doses is interesting to listen to.
However that guy who turns every and any conversion into a story about themselves strains both believability and interest beyond my breaking point.