This is known as Lewontin's Fallacy

https://en.wikipedia.org/wiki/Human_Genetic_Diversity:_Lewon...

Which races are you talking about?

The ones leftover from 19th century pseudoscience?

Can you point me to a science paper that shows a genetic basis for these so-called races?

Not, notably, working back from genes to crazy theories. I could genetically detect ginger haired people, or people with green eyes, that doesn't make those races.

So what defines your races?

I have deviced a test that can, with 100% accuracy, detect a dark skinned individualist. I call it "ocular inspection" and it uses eye tools.

Using the same tools I can with 100% accuracy detect someone with red hair from someone with brown hair. What is your basis for separating people with different skin colors into different races but not people with different hair colors?

What is the genetic basis for the one-drop rule? What is the genetic basis for Barack Obama being black and not white? What is the genetic basis for someone with three Jewish grandparents being Jewish but not someone with two Jewish grandparents? What is the genetic basis for an Irish person being white in 1900 but not in 1800?

No one denies that there are genetic differences between races, but the categorizations are completely arbitrary. Someone who is one-quarter black is more genetically similar to a typical white person than a typical black person yet they are still classified as black. That is what is meant by race being a social construct.

Or maybe that's because there's actually a scientific consensus that there's no biological races so to speak : http://www.americananthro.org/ConnectWithAAA/Content.aspx?It...

It's still a mystery to me how it is possible, from a merely logical point of view, that two groups are more diverse internally than between them. Especially (but not necessarily) when all the elements of one group are different from the element of the other group for at least one constant characteristic.