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I'm generally a fan of "blurry" definitions where something can qualify as X if it fulfills a few of many criteria. I think trying to create hard rules around blurry areas like race and culture is fool's errand, and Scott does a great job laying out how overly strict definitions can go wrong.
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Notes -
Lewontin's Fallacy also works here and usually I mention it in such discussions, but I was thinking about "differences" in a more colloquial sense from the perspective of how a layperson might think of it, before switching to variation when it comes to phenotypes (most people have an easier time imagining phenotypical than genetic variation, especially at a locus-level). Hence the smell test using something more readily visualized, especially since most people are already at least cursorily familiar with commercial ancestry kits like 23andMe.
At a given locus there might be more variation within groups than across groups (not true in many cases, for example, the loci associated with lactose tolerance and skin color would likely have more between-group than within-group variation when it comes whites vs. East Asians, and whites vs. blacks, respectively), but once you consider more and more loci you start to get clean separations. Hence the aforementioned exercise Europeans and PCAs when it comes to Europeans, East Asians, and Western Africans. A randomly selected young athletic man might on average be only about 10% taller, 10% faster, 50% stronger, and have a slightly faster reaction time than a randomly selected young athletic women, with both groups having substantial intragroup variation for each of those traits. However, in terms of overall athleticism, almost always the man will be more athletic than the woman.
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