A friend who is an anthropologist and well traveled says the same thing. He's been to the headwaters of the Amazon and while customs may vary from tribe to tribe skin color is not an issue.
He's traveled in Nepal chronicling various tribal customs because the king wanted to document his country's cultural history and in this case customs varied from the lowlands to the heights of the Himalaya mountain but skin color is not an issue.
nuf said!
Excellent point