Why do some people always like to make fun of other people's shortcomings? That man's defect is for you .. Will you be happy to do so?

Some people may be unintentional, but the listener is intentional. I think I have been in the same situation as you. The best way is to tell him that everyone has shortcomings. There's no need to joke about it. It's not funny at all. If you feel embarrassed to say it, it's best to listen in one ear and come out in the other, so that you won't care too much about what that person said. Be happy, don't be unhappy about such things.