I know 3 people in my family who do this and I'm finding it incredibly rude.
DH, MIL and my own father.
Basically, you can be explaining something to them and then they ask a question asking you to explain the VERY thing they're explaining because they weren't listening in the first place.
MIL is the worst.
She doesn't listen at all but will shoot questions at you, listen to the first sentence and move on to something else. I think she has ADHD (and rudeness).
I find it maddening. I thought it was just my father who did it, then I met MIL and my God. DH has started doing it now he's getting older and I'm probably going to divorce him (for this and several other reasons!)
Does anyone else know people like this?