Any genetic differences between the races is caused by adaptation to the environment. Such as skin color. The differences are caused by differing sunlight intensities in different regions, causing vitamin D deficiency or ultraviolet light damage.
Humans, just like all animals, change over time to adapt to their surroundings. You have to take the phrase "Only skin deep" metaphorically not literally.
Science has disproved all grounds of racism again and again. This "White Genocide" is total bull****.