Do they have problems with conversional logic?

I'm curious to know your experiences about this.

Edit: the title should say conversational**

My dx rx ex would be really bad with conversational logic. For example, I'd be talking about something, and after I'd be done speaking, they'd say something like "but the thing is" and then start talking about something that's not really related to what I said, at least logically.

When I'd tell them I was confused, they'd look at me like I was stupid, saying something like "it didn't have anything to do with what you said, obviously"

Then why say "but the thing is"? It's like they have no idea they're talking about something irrelevant