[ChainOfFools]

I don't follow the conclusion that you're trying to draw. It sounds like you're saying that people do not self-report their own ancestry accurately better than chance.

On the surface of it this sounds absurd, because (unless adopted) people do not determine their ancestry by looking at photos of themselves. I can see getting proximal affiliations wrong, confusing or missidentifying oneself as being half Italian when they're actually half Iberian, or or confusing turkic ancestry with Persian. But I don't think people are going to not know whether they are primarily of say East asian, african, or european ancestry.