Redefining the word "race" so it does not apply to the human varieties does not make the fact of human varieties go away, and so fails to make a counter-argument against racists. "Racism" exists, and saying "race doesn't exist" doesn't change that. All it does is mean that to be consistent you'll have to call it "variety-ism", which is awkward and irrelevant.
Racism is asserting superiority of one group of humans over another, and generalizing without evidence.
You could think certain people are genetically better adapted to cold or hot climates. That by itself is not racism, it becomes racism when you say that everyone who cannot stand cold weather is inferior, when in reality, it is totally dependent on circumstances.
I think people failing to see the difference stops some honest discussion and people go on a witch hunt. In this case, blocking the person may well be justified however.
I'm repeating myself here, but per WP, "Scientific racism is [...] alternatively the practice of classifying individuals of different phenotypes into discrete races."
It seems worth taking this criticism up with the authors of, for example, Risch et al 2005 [0].
From the abstract: "Genetic cluster analysis of the microsatellite markers produced four major clusters, which showed near-perfect correspondence with the four self-reported race/ethnicity categories. Of 3,636 subjects of varying race/ethnicity, only 5 (0.14%) showed genetic cluster membership different from their self-identified race/ethnicity."
It seems worth asking how a paper like this got published, as late as 2005. Scientific racism may be even more entrenched than many have feared...
I don't want to read too far into your comment, but if the intent was similar to: "Interracial children don't fall into classical racial categories and, as such, are proof that racial categories don't exist," that's fallacious. The fact that a lab and poodle can produce a labradoodle doesn't negate the fact that labrador and poodle are dog breeds. The spaniards had a system that classified people by percentages of ancestry, e.g. quadroon, octaroon. Today we have more modern technology and ancestry can be determined though the analysis of genetic markers. The usefulness of race can be (and is) debated. Its existence is hardly debatable.
Mr. Yarvin, is there some way to get ahold of you, via email or IRC? I'm not some hater who's pissed off about your political views or anything like that. This is very important. Thank you in advance,