A funny idea, but not always. Some of the "ruling class" are genuinely racist.

It's a logical continuation of them being on top. Some people are better than others, in their opinion. They are better than those not of their group and set of opinions, their country (sometimes of residence and not where they rule) is better than other countries, their ethnicity is better than other ethnicities, and their race is better than other races. The reason they want to impress these hierarchical divisions is they want to impress their worldview, not to create division.

So, again about USA. You guys have that crap in everything. That's why motivational letters by American students to European universities are a comedy genre. You don't even see it, but your official tone (and even much of the political discussions and social one) is half bullshit, half markers of identity (that kind of neighborhood, that kind of ancestry, that kind of some other tribal classification, all clear cut and exclusive). Well, there are also markers of connections thrown here and there. And your discussions are usually not discussions, they are like playing cards with those markers instead, where one marker beats another, there can be no discussion after that.

Sigh. I have relatives in the USA who moved there long enough ago to be carriers of that and other things too, so when my uncle was helping me with writing a CV, for the initial variant I just followed his advice and I'm not ever showing that pretentious crap to anyone. Despite him being a tremendous help with my executive dysfunction (and unfortunately impediment where he conditioned one project on me finishing uni, I still haven't finished uni, it's indefinitely paused).