As members of bands or tribes, humans can be quite egalitarian … Individuals who otherwise would be subordinated are clever enough to form a large and united political coalition. … Because the united subordinates are constantly putting down the more assertive alpha types in their midst, egalitarianism is in effect a bizarre type of political hierarchy: the weak combine forces to actively dominate the strong. … They must continue such domination if they are to remain autonomous and equal, and prehistorically we shall see that they appear to have done so very predictably as long as hunting bands remained mobile. … The egalitarian political lifestyle of Upper Paleolithic hunter-gatherers could have profoundly affected our evolving social nature.

The three African great apes, with whom we share this rather recent Common Ancestor, are notably hierarchical. … Starting about five thousand years ago … people were beginning to live increasingly in chiefdoms, societies with highly privileged individuals … But before twelve thousand years ago, humans basically were egalitarian. They lived in what might be called societies of equals, with minimal political centralization and no social classes. Everyone participated in group decisions, and outside the family there were no dominators. For more than five millennia now, the human trend has been toward hierarchy rather than equality. But the past several centuries have witnessed sporadic but highly successful attempts to reverse this trend. …

Hierarchy in the Forest (1999) – Christopher Boehm

Egalitarianism is a form of winning at the hierarchy. Humans have been evolving for millions of years. Male and female are sexually dimorphic suggesting different evolutionary pressures. I have no idea why you consistently want to focus on the last 8000 years as the sum total of what needs to be discussed.