Data on income inequality only tell half the story. The differences in the ways people live are only partly determined by income. They’re also determined by the levels of government services provided to everyone.
This is most obvious when it comes to healthcare. In the rest of the developed world, everyone has health insurance. Depending how you count, about a quarter of working-age Americans don’t. Real inequalities in health coverage are even greater, since the richest Americans tend to have the best insurance.