I am using the word discrimination in a general sense.

It's not *just* the color or race of someone's skin, but also a lot other factors.

If we trace back the repeating attributes of social class and wealth they all tend to gravitate to similar genetical discriminations (from wikipedia: "ability to distinguish one thing from another.")

And once the discrimination crosses the ingroup barrier, then the measure keeps "ranking" them among the different outgroups.

Before the internet the ingroups were not measured against outgroups as much.