Children are always afraid of being laughed at.

Did he have any experiences when he was a child that left him with inferiority complex? For example, being looked down upon by neighbors and relatives or being violent. At this time, parents need to spend more time with him and establish his correct self-confidence. It's really bad to care about what other people think. It is best to take him to see a psychiatrist to understand the child's heart (don't think that seeing a psychiatrist is sick, you can find the child's problem as someone who knows the child better).