Yeah buddy. Barely any variation at all. Populations are genetically distinct in terms of the shape of their skeletons, the color of their features, the diseases they contract, the foods they can eat, but WE ARE ALL THE SAME.
What the poster was saying is that there is more genetic variation inside a given "racial" group than between groups. This is a well known scientific fact, and it was the basis to demolish mid-20th century racist theories.