It is rude to exclude someone from a game.
Jose was picking a team to play a pick-up basketball game, and one guy was left out of the teams.
Jose has to decide what to tell the last guy.
Jose tells the guy that he can be a substitute for his team.
Jose tells the guy to get lost, because he's not good enough.
The guy feels relieved that he gets to play and doesn't feel as embarrassed.
The guy's feelings are hurt, and they feel disrespected.