It's rude to say insulting things about others.
Maggie is hosting a party with her disabled friend Mark, and the atmosphere is awkward.
Maggie wants to entertain her guests.
Maggie creates a karaoke contest for the guests allowing Mark to be one of the judges.
Maggie makes a joke about Mark's disability.
Mark appreciates Maggie, and he makes sure the guests have fun.
Mark's feelings are hurt.