When I went out, I found someone looking at me with contempt and telling others that I laughed at me, which made me very angry. I didn't offend anyone, did I?

First of all, don't care too much about what you think of yourself. After all, you live for yourself, not for other people's opinions.

Secondly, what others think of themselves is what others think, and his opinion does not represent you. He made such a wrong judgment without knowing you. Why take such a wrong judgment seriously?

Finally, no matter how others look down on you, you should look up at yourself and prove that he is wrong with practical actions. You are excellent and get recognition from others through hard work.