What does to laugh at someone's expense mean?

To laugh at someone's expense means to find humor in a situation that belittles or humiliates another person. It often involves making jokes or mocking someone in a way that highlights their misfortune or mistakes. While it can be intended as lighthearted teasing, it can also be hurtful and damaging to the person's feelings or self-esteem. This type of humor typically raises ethical questions about empathy and respect in social interactions.