We love to talk about how being born a certain gender or a certain race shouldn't hold you back from achieving anything you want in America. But what if you are unlucky enough to be born into a poor family, or in a backwoods, downtrodden region of the country?
My experience aligns with the author's. In movies and feel-good stories shared on social media, we romantically idolize the humble rich person, who came from nothing yet somehow stays "true to their roots". And that is a lovely, inspiring mindset necessary to keep people motivated...in theory.
In practice, in order to get ahead in life and to cross class boundaries, you will have to acknowledge that aspects of your upbringing and former way of life are "backwards". You'll have to reconcile that the rich will scorn you and think of your home as a "shithole", and that you "weren't supposed to" make it to the top. You'll have to see things in a new light, and as the author notes, your social life and identity will take a hit (e.g. old friends who won't come to your wedding, or dating prospects who are afraid of being associated with lower classes).
There is a moral failing in our country where the pursuit of money is seen as the objective optimal thing to do. But it's very reasonable to look at how money changes people, and to turn away from such a lifestyle in disgust.