See, I can't get annoyed when that happens because I do it myself. I think my hearing is fine, but every once and a while I am trying to think and listen at the same time, and the listening usually loses. ::
oh, thats normal.
It's not easy to listen to 2 things at once (your own thought process and someone else). When I'm driving and need to think about where I'm going, I have to turn the radio off or else I can't hear myself think.