From the article: "Most people are very ignorant of the norms and values of the social classes more than one degree above or below their own." Somewhere, there must be a "how to" guide for social class. There's a questionnaire, but other than some meaningless content on Quora, not much guidance.[1] Where there is guidance, it's about language usage.[2] The classic on this being, of course, "My Fair Lady"[1]. This is…
If you're ignorant of the norms and values of the social classes more one degree below you, that's simply due to not watching television.
Keep in mind that television itself has significant class segmentation. The vast majority of characters on shows I watch are from my class or present as such.
On the occasion that I do see something from a lower class, it's quite jarring and I also have a lot of trouble differentiating race and class in such scenarios (>90% of the "lower class" characters I see are African-American).