Your original argument is flawed. You actually have no way of knowing if most people are “envious” of the US. That’s pure speculation on your part. We can look at numbers, if we do we see some where the US looks really good and some where it looks really bad. That’s not even touching less tangible things like culture, community and family values (all of which are extremely subjective). The US is definitely a harsh place to live in many ways. And yes, I’ve lived in other countries and traveled extensively. I’ve seen plenty of poor (by American standards) families living happily together in ways that would make many Americans envious.
In short, your claim is too subjective to be useful and is directly contradicted by multiple metrics.
The context of the thread assumes that we're talking about wealth. The original claim was something like, "in the US you must be in the management class in order to have a life worth living". I.e., we're talking specifically about wealth and not other subjective factors. To be perfectly clear, there are no metrics that contradict that the median American is wealthy by world or historic standards.
Maybe you're arguing that I have no way of knowing that poorer people would be envious of richer people; fair enough, "envious" was figurative language on my part.
In short, your claim is too subjective to be useful and is directly contradicted by multiple metrics.