This is a weird one. I don't think the problem with rich people is that they consume luxury goods. That's actually a good thing overall. Let them have their megayachts, megacars, golden toilets, etc. Someone has to build those.
I think the problem is when they use their unlimited funds to purchase stuff they shouldn't own. Newspapers, TV stations, social media, etc. That kind of power, often flaunted openly (see the bezos scandal when they literally wrote something along the lines of "if you screw with us we have wapo at our disposal") is not something that should be in the hands of one person. Or a family. That's way way way more dangerous to society than them snorting caviar off of models' bodies, or eat gold leaf you won't believe they're not burgers with truffles on top.