In that case, humans and bananas are the same, right? No need for fine distinctions. After all, 50% of our DNA is the same.

The fact that sub-Saharan Africans are not of partial Neanderthal descent while every other race is does create the possibility that there are fundamental genetic differences between them and all other races. However, proving any such differences would be near impossible. What's racist is to claim that such differences exist when not a shred of scientific evidence for such a claim exists.