I feel uncomfortable when people call me stupid. I thought to myself, I am so sad. What should I do?

There is a simple reason. People don't like to hear it badly. You care about this again. That's why this happened. But that person will call you stupid. I don't think you have to make friends with that person. If you are really bored, you can ignore him on purpose, so it doesn't matter. However, since you think about it every day, you are jealous. I suggest learning the psychology of jealousy and then introspection. I believe there will be no such troubles in the future.