What does it mean to tell sad things as jokes easily and roast the listeners on the fire?

And the second part says, "Laughing is my criminal." . If you cry, I will laugh at you. "I put my happiness above others (or myself)? ), this is undoubtedly a bad behavior, so there is the second half of the sentence. It is to make you laugh and make it difficult for you to choose on the grounds that others are suffering. And joking with your own sadness is probably a kind of self-mockery, right?