The real problem with that statement is that it misrepresents the problem.
The fact that our poor live as well as middle class (or even upper class) in developing countries does not mean anything, because our poor do not compete for the same resources and opportunities as those people. Our poor compete with our rich, and the wider that gap, the worse the situation.
In other words, what really matters is the standard of living of our poor relative to that of our rich.