Dear Blueskies, I think you are doing a fine job for this early in the game. I totally agree that verbal bullying of ones parents is very unacceptable.
When he is having cravings, etc., calling his sponsor or going to a meeting right away is the best constructive action. Be careful of getting sucked into the therapist role (unknowingly). He is the captain of his ship, now.
Be grateful that you all are going through this at 22yrs.--not 32yrs.,---or 42yrs.
Keep the faith.
dandylion