Understand whether 'laugh at' indicates simple amusement or an intention to mock or make fun of. When she slipped on the ice, her friends laughed at her.
Pro Tip 2/3
Cultural Sensitivity
Be aware that laughing at someone can be considered rude or hurtful in many cultures. He didn't realize it was rude to laugh at someone's accent.
Pro Tip 3/3
Self-Deprecation
'Laugh at oneself' shows the ability to be funny or light-hearted about one's own mistakes. She could laugh at herself for forgetting the words to her song.