Unless there's something I've missed, it doesn't appear that he's saying it's not ok to be rich. He's saying that it's not ok to be obscenely rich (which billionaires undeniably are).
His whole life he has watched as the ultra rich have done things like deny climate change, financially back politicians who deny climate change and/or block climate action, financially back climate disinfo talking heads, etc. So his frustration is understandable.
There are exceptions of course, but the vast majority of billionaires are callous, greedy, egocentric nightmares who give little to no regard for anything other than increasing their already vast wealth.
Simply put, if you have great privilege, you have a responsibility to use that privilege to be an ally in the fight against climate change, not do things to make the fight harder.
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