How do parents deal with when their children laugh at other children?

Once my child laughed at a student in their class for wearing poor shoes. When I heard my child say this, I was very angry and felt very uncomfortable, so I gave the child a lesson. The child cried very sadly that night. In fact, I couldn't bear to treat the child like this, but I think the child made a big mistake this time. What should others do if they are psychologically traumatized when they laugh at others? I remember when I was young I was laughed at by my deskmate, and the reason why I was laughed at was because I was not dressed well. Later, after I calmed down, I told my child about it and the child cried again. I knew he must have realized that he Wrong, so I later asked him to apologize to his classmates. The next day he brought his classmates home. I also apologized to the child and gave him many gifts. I also told his classmates that in fact everyone is equal. Yes, if he likes it, he can treat my house as his own and come over often to play. After this incident, my child also became good friends with him. I heard that the two of them even fell in love with each other.