What will you do if your boyfriend often jokes about your physical defects and gives advice for a while?

Maybe your boyfriend is a careless person, he is informal, he doesn't think your so-called physical defect is a problem, just kidding. Another possibility is that your boyfriend doesn't know how to respect people, and he cancels your defects to meet his psychological needs. If so, it is a moral issue, and you should consider the consequences yourself. At the same time, I suggest that you can communicate with him seriously and express your true attitude that you don't like this kind of joke.