It's for your own good. Keep the focus on solving problems rather than judging behavior. This childhood experience strongly effects the way people respond as adults. Being specific softens the criticism by making it relevant. This is an opportunity to encourage him to keep doing it.
Praise is a tremendous conflict management strategy.
You feel good about praising somebody. They feel good about being praised. You know, Mrs. Smith, you're one of the people who always comes in for her refills on time. I wish more of my patients were like you. I feel good about it because I know that you're getting the benefit of your medication.