I don't think anyone making $400,000 a year is going to have much angst about billionaires, or they shouldn't anyway, it's wasted emotional effort. These folks are nowhere near billionaire territory obviously. The fact some billionaires exist in the US doesn't really concern me, at all.
Should we have a wealth tax? Maybe, I'd need to see the details to offer a specific opinion. I also think that wealth tax would generate relatively little revenue, as the countries in Europe discovered. I see folks on FB constantly complaining about billionaires. I guess it lets them blow off steam.