That's pretty much the root philosophy of the Nation of Islam, and one of the platforms of the New Black Panther Party. Just as white racists had their theory that blacks were inferior since they supposedly looked more like apes, they have their own theories. One is that melanin makes you superior in intelligence and other things, and whites are inferior because they don't have as much. Another theory is that blacks are the true humans as originally dark-skinned from Africa, and whites are the degenerate offshoots.
I was merely reporting on the explanation used to explain why some believe blacks can't be racist. It is of course an utterly idiotic idea.
I think one of the most amazing things about white and black racism is how often they align. White racists said, and some still do, that blacks are inferior because they can't do abstract thought and are excessively emotional.
Many black racists today say essentially the same thing, except they claim these same qualities make blacks superior, not inferior. Sun people vs. ice people, and all that nonsense.
The black racists, or many of them, just aren't very original, which sort of validates what the original white racists were saying.
That one actually makes some sense. The scientific consensus is that humans evolved in Africa and it's highly likely they were dark-skinned, for obvious reasons.
White or light skin is probably a later evolutionary adaptation to low levels of sunlight. It maximizes the production of vitamin D in situations where there isn't much sun, but has obvious drawbacks in situations where there is a lot of sunlight.
This common-sense idea doesn't, of course, provide us with any info on which group is superior. Maybe whites are the more highly evolved group, while people with dark skin are stuck at a lower level. Or maybe whitey, as you say, has degenerated from the original superior stock. :)