"Class Bias—The Real Enemy" that gave my thoughts on class. . . back then. Well, the book Caste The Origins of Our Discontent by Isabel Wilkerson explains it all and in such an understandable way. This NYTimes bestseller—28 weeks on the bestseller list—is a must-read book by all.
It really takes the wonderful book Sapiens by Yuval Noah Harari to the next level in helping us understand the importance of "humanity" in any culture.
Here is an excellent seven-minute video review of the book with Isabel Wilkerson from the PBS News Hour.