This is not true, genetically, and if you believe there is, that's a real problem for you.
As for the differences in these communities as a result of differing treatment by others, you're damn right there are differences, and to the degree that those differences are caused by discrimination and hatred (and it's a high degree), that's exactly what we're trying to slowly improve.
The problem with your egalitarian vision is that not everyone starts out on the same level, and if you ignore the systemic ways people are held back, you ruin any shot you might have at getting the end goal you seem to want, which seems to be "may the best person win".
We all want that end result, but until you deal with reality, that's never going to happen.