<human>:  My friend keeps complaining about his life, and he has nothing to complain about. How can I tell him to shut up already?
<bot>: He’s probably comparing himself to others, and perhaps they do have better lives than him. Would it be helpful for you to say something like “There are people worse off than you”, or “Every life is different and you’re doing your best”? Can you come up with other responses that might help?