I'm not sure where you get the impression that the only ones complaining are well-off.
To some degree, it's just a matter of demographics. One can assume that the more you earn, the more free time you have. The more free time you have, the more time you have to think and talk and learn about things like wealth disparity. Best example might be academics who can afford to spend a lot of time researching this stuff and consequently have the most compelling data about it to share with the greater populace, and generally have the means to do so because of their credentials and standing. The vast majority who are directly affected simply don't have the same kind of voice (that people care to listen to) or the time and energy to have a voice when they're working 3 jobs.
On the other hand, it could just be that you live in a bubble surrounded by moderately well-off to wealthy people. Of course then it's obvious why it would seem that only well-off people complain about. They're the only people that are visible to you.
To some degree, it's just a matter of demographics. One can assume that the more you earn, the more free time you have. The more free time you have, the more time you have to think and talk and learn about things like wealth disparity. Best example might be academics who can afford to spend a lot of time researching this stuff and consequently have the most compelling data about it to share with the greater populace, and generally have the means to do so because of their credentials and standing. The vast majority who are directly affected simply don't have the same kind of voice (that people care to listen to) or the time and energy to have a voice when they're working 3 jobs.
On the other hand, it could just be that you live in a bubble surrounded by moderately well-off to wealthy people. Of course then it's obvious why it would seem that only well-off people complain about. They're the only people that are visible to you.
And finally, who cares who says it if it's true?