Why do people say "black is black" What does that mean?

Go Youtube, listen to BLACK IS BLACK by Los Bravos.It does not refer to skin color, so your answer is 'NO".In another vein, ever heard the complimentary expression, "That's mighty white of you."? Really a compliment.That one baffles me. I hear people say it in old movies. I just read other explanations here and they are all mistaken.Maybe type it in for Wikipedia.