In a vacuum you may have an argument, but income inequality is really a proxy to multiple larger issues. A big one is lack of healthcare and/or health issues driving people to bankruptcy. Second, which many people here are keenly aware, is the cost of education. And finally, people having few other options when in a crap work situation.

So yeah, it doesn't matter that Bezos has more material wealth than any of his workers, but what matters is that healthcare will not bankrupt him and he can easily send his kids to school.