You shouldn't laugh at your friend when they hurt themselves.
Billy is skateboarding with friends, when his friend Evan falls off his skateboard and skins his knee.
Billy wants to do something about Evan.
Billy asks if Evan needs help and tries to get him some medical attention.
Billy laughs about Evan's injury and posts mean things about it on social media.
Billy is seen as considerate and helpful by his friends, especially Evan.
Billy is shunned by his friends for his inconsiderate behavior.