His training is more important

One time when he had come on vocation, he went to Iraj's School to ask about his school work. They had apparently complained that he offends his teachers so much; they had called him (my son) to school and slapped his face. When I was informed, I became sad. I told him: “Why did you do that?”? Why did you humiliate him in front of others?
He answered: if the child is dear to then his training should be more important.
When he was coming, he was so close and sincere with children and was playing with them, so that the neighbors realized that he has come because of the children noises.