I've read variants of the point that the protesters are "rich" by a global standard. It's an interesting observation, but I don't see how it should change the protesters actions or positions or mine as a mostly-supporter.

I'd compare this to the civil rights movement. There were plenty of privileged whites who protested segregation in the US. You could have then reasonably argued that they were privileged because the US systematically enslaved and then repressed blacks. And I would say to this, "So what?" They were protesting something they saw as a problem, on the basis of their shared humanity.