I don't know why, every time I go to a new place to work or live, there will always be many people laughing at me, to my face and behind my back. I think I look good.

I think it may be that you are sensitive, and most colleagues get along only at the work level. Unless there is a conflict of interest, few people pay attention to malicious attacks. You can think from another angle. If your colleagues don't really take your bad words as jokes, do they think you have a good temper and can't afford to make jokes? If you really think he has gone too far, you can euphemistically express that you don't like it. If he is as usual, he must be a very low person with a good attitude. After all, everyone is busy with life. Not everyone has time to stare at your shortcomings, but more often they think too much.