And you obviously think that those multiple population cohorts are different, otherwise you wouldn't have mental models for different ones in the first place.

Population cohorts are superficially different. Not fundamentally though. People with different color skin exist. There is a proven tendency to favor those who look more like you. Thus from that, when a majority is one superficial cohort, and a minority is another, this is a natural pattern.

Whether the minority is black or white, and the majority is black or white, or whatever differing ethnicity doesnt matter. It could be German majority and French minority, or French majority and german minority, the majority population will tend to act towards how I describe.

Population cohorts only act different based off their size, and how big they are compared to everyone else. All other aspects are superficial, largely.

"All humans are the same to me" isn't something actual humans can even model, outside the special instances of infancy and certain dissociative drugged states. Recognizing and cataloging distinctions is literally what your neural net of a brain is for.

I believe your nitpicking over semantics rather than what Im trying to actually say. When I mean, all humans are the same, I generally mean, the vast majority(as in 99%) are approximately similar, at least in potential, in terms of skills. Take mostly anyone from mostly anywhere and they will become a great runner if they train enough. They wont be Olympians or world class, but they will be very good. The same with math. Not everyone can be a math PHD, but getting good enough to go beyond calculus? Im confident that 99% of people can reach that height. To be the best of the best, does require small inherent differences in potential. These are however, minute, and do not impact the ability of people to be as valuable or having the same rights as other people.