My boyfriend joked in front of outsiders that I don't know anything, and living is a burden. what do you think?

Your boyfriend is not very friendly! Although it is a joke, it is a joke that hurts people's self-esteem and should not be said, let alone in front of outsiders. I don't think he respects you at all. Be careful when you disrespect your boyfriend. First, tell him seriously that you don't like his jokes and that his jokes make you uncomfortable. Tell him not to joke like this in the future! Second, if he realizes his mistake and can really correct it, he can continue to get along. If he doesn't feel wrong, or knows that he is wrong, he won't correct it. I advise you to leave him as soon as possible! Remember: respect is the foundation of love!