That's such bull .
I'm a third World country middle class man, and I know for a fact I have a better standard of living than all of poor Americans. And probably a better life than most American middle class people too.
I work 6 hours per day tops from monday to friday. I never work saturdays, sundays nor holidays and I get 2 and a half months vacations. I get healthcare, free education for me or my children (if I ever decide to have some). I have a city house and a beach one, a car and a quad bike. I play soccer and tennis twice a week each, I have barbacues with my friends three times a week and I go out every weekend.
Many middle class Americans probably earn more than me, but I doubt they enjoy life as much as I do. I work for a living, I don't live to work. I'm lucky as and I wouldn't change my life for anything in the World. And the kicker is, you would be surprised how many more people are in the same position as me in this hole third World country of mine.
If a non-exceptional dude from a third World country like me can have it pretty decent, imagine the non-exceptional dudes from countries like Norways, Sweden, Spain, Australia, etc.