It's rude to refer to people as pigs.
Jerry made new friends at school, and they hang out during the day.
Jerry wants to give nicknames to his friends.
Jerry calls his friends nicknames based on what they're good at.
Jerry calls his friends pigs because they eat lunch together.
Jerry's friends think Jerry is a positive person and like being around him.
Jerry's friends are offended and don't want to eat with Jerry.