Yes, because it's a sample of human racial perceptions, but at any rate "who I know" isn't the sample I quoted, it was "who I know of", and the latter is a larger sample than the former. Further, "who I know of" is a pretty good informal indicator given that I know of mostly Americans (and a particularly diverse group of Americans at that). Perhaps you mean "is this sample statistically significant?", in which case the answer is "No, and I never pretended otherwise".