Or go visit there.
Even in rich cities, it felt like I was in the lower middle class area in my suburban area.
Probably dial back your assumptions a little bit. I've earned my opinions just as much as you have.
But I’m fortunate to make a US salary living in the EU.
I didn't say it'd be easy. I'm just pointing out that only one of the two groups being discussed has a real choice in the matter.
That's why people compare spending power instead of how much money you earn, because that comparison is meaningless.
Also at this point both have seen such negative upward trends in housing prices that the assumption that someone placed in the middle class owns a home at all (without any debt attached) is questionable. (But that's just a comment and besides the point)
Middle class people from wealthy nations who move to poor countries are relatively rich by the standards of their new country. Middle class people from poor countries who move to rich countries are relatively poor by the standards of their new country.
If you are middle class in EU and have little savings, moving to US will do the opposite and you would be better off.
Your comparison holds for the inverse: getting most of your quality of life from static wealth.