Opposite here. Though I am not diagnosed.
I hear everything, aaaand it goes in and I can fathom most of the things going in even at the most inappropriate times...
During sexy times with the wife I hear a floorboard creak and it can put me off entirely. Was it the house settling. A burglar!??!! Maybe the dog, it's the dog. No, the dogs are in the living room. BURGLAR. No, it's just a creak. What was I doing again.
During my mother's funeral after her doing of a horrible bout of cancer and I'm devastated about it...but I hear a bird tweet outside and I am now thinking about which bird it was and why it was tweeting.
At the cinema and the guy 5 rows back opens up a packet of m&m's and I'm more totally taken out of the movie that I was engrossed in.
Middle of a conversation with the wife in a pub and that table over there are taking about their upcoming holiday, whilst that table over there can't work out how to use the salt and pepper mills...no, sorry, they've worked it out. No, he's got it upside down. Now the lids feel off. What was you saying, dear?
No idea if it's ADHD or I'm just (un?)lucky to have an overhearing superpower.