Diff'rent Strokes (1978)

S02E22 Skin Deep or True Blue (a.k.a.) Guess Who?

Kimberly's new boyfriend, Roger, proposes a double date with his sister and Willis, but things take a turn when he learns about the race of his girlfriend’s brother. Upon realizing that her friend holds bigoted views, Kimberly feels her cheeks flush with embarrassment, quickly shifting to a much deeper shade of anger.