It's bad to insult people.
Mitch is a politician who just won an election against another black politician named James.
Mitch wants to call James.
Mitch tells James that he has a bright future in politics and tells him not to give up.
Mitch tells James that maybe he should become a rapper instead.
James feels inspired and is appreciative of Mitch for going out of his way to tell him that.
James feels disrespected by that and hangs up the phone immediately.