The only other thing I can see is trying to teach your son about understanding/guessing what someone is really saying, vs. the exact phrase they use. For example, if the adult says "stop kicking with your knee," what are they really wanting you to stop? Making noise by hitting the table... etc.
Oh, boy. EASIER said than done. Ever see that movie about Alan Turing..."When people talk to each other, they never say what they mean. They say something else and you're expected to just know what they mean."
Saying one thing and use a facial expression or body language to indicate you mean the exact opposite of your words is a classic example.
Sounds more like my son, however; he usually easily gets what others are saying or want, however his expressions are sometimes problematic. Meaning to be funny-sarcastic but not smiling (which only comes off as being rude). Has that been an issue for your ds before ? My ds does have a diagnosis of asperger's, which is I suppose where this stems from.
