Does your son have an autism diagnosis in addition to ADHD? The literal thinking, social struggles, and conversational skills deficits could all be symptoms of autism. Those were some of the lingering symptoms that made me consider autism for my own son around age 10 (got the additional diagnosis at age 12).
I agree with the suggestion to set some social rules. We find setting rules for as much as possible helps. For instance, I taught my son to always ask what his guest wants to do and do that first when you have a friend over. (He also comes across as bossy.)
We also have the same struggles with reading comprehension. Individuals who are very literal thinkers struggle to make connections and inferences and to interpret what they read. My son cannot see himself in others unless they are exactly the same — and who’s exactly the same?
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism