The US does have the highest GDP (by a large margin).
https://en.m.wikipedia.org/wiki/List_of_countries_by_GDP_(no...
GDP per capita is not the same as GDP.
https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nomi...
The US, as a nation, has the highest GDP, and therefore is the wealthiest nation in the world. The individual wealth of Americans is lower than some other countries (but not many), but that is hardly relevant in a discussion about the wealthiest country. If OC had said "Americans are the richest people in the world", you would be right. But OC did not, and being deliberately obtuse does not change that.
I realize you were provoked, but please don't break the site guidelines even when another account is doing so. That's the only way to prevent a downward spiral.