In therapy he learned that he could not handle rejection/lack of respect because of his painful past. He learned how to step back from his reactions, validating and acknowledging the feelings of the child self and telling him to be quiet and not act up and think about how to handle the situation in an adult manner. It took some time to learn these skills but Paul felt much better about himself. He became a much nicer person.
As psychologists we teach skills he never had a chance to learn.