Earlier quoted context omitted.
The world income comparison thing at the end is not meaningful in the slightest. Why not? I would say that it's very important to understand that even middle class Americans are quite well off when compared to the vast majority of the rest of the world.
Because Americans aren't buying groceries or paying rent in the rest of the world, they're doing that in America. Knowing that you're theoretically well-off in comparison to people living in other places doesn't put food in the fridge, and it tends to be deployed to shame people who are having a tough time making ends meet.
It's not theoretical. It's factual.