The US is way down the list at 120 for income equality, worse than most of the "developed world". That median hides a lot in a country of over 320 million.
https://www.cia.gov/the-world-factbook/field/gini-index-coef...
https://www.cia.gov/the-world-factbook/field/gini-index-coef...
Last I checked, poverty line in the US is at the 85th percentile in world income.
And most importantly, most of that inequality and poverty levels are what are called pre-tax-transfer: they do not account the value given the poor and lower incomes via benefits, which lowers a lot of that inequality (and makes our poor even richer than most of the planet).
For fun, pick a country that you think is better for lower income people, and let's look into it :)
Inequality is relative. Absolute income means a significant amount, even more so to the poor.