Cool story. I already agreed this is the result of insular thinking and I already accepted some of these insular groups have more "power" (social/political/financial/etc) than other groups.It's not an issue of the Rich being prejudiced but rather of prejudice being one of their tools to enhance their privilege. It's not a universal thing among the Rich, obviously, but it is for the conservative faction. They've played straight white middle class people off against everybody else in a ruthless fashion. They've cultivated deeply divisive attitudes & beliefs because it helped them win elections from Gingrich forward. It's the basis for Trumpism entirely.
I've already covered everything you try to "argue" against me.
Yes a group with "X" in common will bind together against a perceived group of "non-X". Humans are pack animals and and evolution lead us to form an affinity for our own. Not rocket science. It applies to every insular (even socially) group you can imagine.
But this trait is not inherently racist and I wont let anyone pretend it is.