I'll admit it. I can be somewhat of a snob, particularly when it comes to white people. Yes, those terms like "trailer trash" and "PWT" (our secret term for poor white trash when we were teenagers) are familiar to me. However, I didn't grow up perceiving or labeling myself as white (although many people likely see me as such). To this day, among my Greek-American family the response to the question "Are they Greek?" will often be, "No, they're white." So, I have an additional layer of "other" that applies to white people who have no obvious ethnic ties (something tangible other than "American"). 

All that is to get me to two more must reads:
White Trash:
The 400-Year Untold History of Class in America
Nancy Isenberg
I listened to this on audiobook rather than reading it.

Hillbilly Elegy:
A Memoir of a Family and Culture in Crisis​
J.D. Vance

If you are seeking to better understand how we got to where we are now in this country, these should be part of your educational process.