The Fresh Prince Of Bel-Air: Blood Is Thicker Than Mud
Series 4 episode 8 from 1993.
Will and Carlton apply to join a fraternity and while the former is accepted the latter isn’t.
It’s because Carlton isn’t black enough.
Will sticks up for him and even tells him that Carlton was accepted but not Will.
It shows a nice side of Will’s character, shielding his cousin from hurt.
Movie pages here.