You shouldn't laugh at someone's singing.
James and his friends are out at a karaoke bar, and James' friend Linda is singing terribly off-key.
James wants to spend more time listening to the good singers in his group.
James keeps suggesting songs to the best singers in the group.
James makes a joke about Linda's singing and gets his whole group of friends laughing at her.
James gets to hear relatively talented people singing instead of Linda.
Linda storms out of the room and refusing to ever come to karaoke again.