First of all, nicknames
Most of his children should have experienced being nicknamed by classmates at school, which seems to have become a form of communication between classmates. However, due to some students, this nickname may involve some of his own ideas. He doesn't want to accept this, thinking that his classmates are laughing at him, and it will also lead to his psychological inferiority. He will be unhappy if someone calls him by his nickname at school.
Second, the guidance of parents.
When a child is nicknamed by his classmates at school and comes home sad, his parents should give him a correct guide and let him know that nicknames are harmless, but everyone nicknames him because he likes to play with him, not because of ridicule, and then parents should teach him to treat nicknames rationally and let him know that this is a normal and common thing, which most people will encounter at school. Parents can also share their childhood nicknames and encourage their children to look at it correctly with their own experiences. Don't take this as psychological pressure, because when he knows that his parents sometimes know that he is not an alternative, this is something that everyone will experience. His parents have experienced it, and his heart will be more comfortable.
Third, empathy
While educating their children to treat nicknames rationally, parents should also guide their children not to give their classmates those unpleasant nicknames casually. If it's cute and interesting, it's ok, but if it involves nicknames that are not good for classmates, you can't give them. While persuading him to accept nicknames, you should give him correct guidance so that he won't go because of nicknames. I'm sorry that he is his classmate.