First, talk to him about it, he may not know he has this problem. Chances are he wont change in a day either. Usually our behaviors are very ingrained in us and going against our natural response may be very difficult to change. Just being aware of the issue, and having a loving person to help them would be a great step in the right dirrection. His paernts, most likely, treated him similarly, therefore it might just be normal for him.