I feel like most of these types of beliefs are in the realm of people's desires to differentiate themselves rather than anything intrinsic about how they do it.

There's studies on mammal populations, and as their preferred number of group sizes increases, the 'differentiable' traits also increased. So mammals that preferred to live in large groups had more visible differences in phenotypes than small groups.

If social systems are just an extension of phenotypes to some degree, then all that's really happening is people wanting to differentiate and they have a small differentiable desire in any given direction.

but you be you.