I was born into the working class, and educated in the 1960s. I tend to look at the world through those filters. And like all filters, they may reduce the total signal, but serve to increase fine contrast and subtle shadings in the data they do pass.

As for ethnonationalism, I have always seen that not so much as an innate property of the tribe, but as a factor that is deliberately seeded and aggravated for socioeonomic reasons. Sure, racism, nativism, nationalism and even misogyny may exist in isolation, but they are also eagerly seized upon to divide and manipulate the masses--for purely economic and class reasons. A man may not be a racist or misogynist or anti-Semite himself, but he will often embrace (perhaps even unconsciously) those positions if it allows him to pay his black, female, or Jewish employees less. And the employer will pursue those policies even if he or she is a racial or religious minority him(her)self, And he will certainly encourage those attitudes in his employees if they serve his or her own economic purposes. I like to call it "the invisible hand".

"Turning against a liberal democracy" may be a social and character flaw, a moral failing, and perhaps even an obsolete biological imperative; but it persists in modern society because it serves a very real purpose in class conflict. This is what modern racism is really all about. This is why a white man who married and loves his black wife, and who has adopted and loves his black child, can still favor economic and political policies that are injurious and insulting to black people as a community. And of course, that man will indignantly (and sincerely) protest that he is not a racist.

The signal is the same, but different filters favor different frequencies.