Role-play in Stressful Situations
For some children, exposure to stressful environments is a great tool to help them come off the same situations when they happen in future. If you already know the situations that cause stress in your child, you can help him understand such situations but in a more visual manner. Consider role playing the situation and including steps about how to handle the conflicts or social pressures that cause your child irritation. This should involve taking turns playing the roles of people in a social setting.
For your child to learn easily, simplicity is the way to go. Make each scenario very simple and affirm your child when he overcomes any challenge however small.