No, it's not, and no, you aren't. Tax brackets only increase in rate. Tax rates don't start coming back down for the super rich. If your income was in capital gains you would pay the capital gains rates. If the billionaire's income came in through salary they would pay income tax.
But they mostly don’t get paid in salary do they so it’s a strawman. The amount of tax paid is proportional to the general utility of the money (wrt day to day living), rather than the inverse. It’s dumb
Perhaps you might want to learn how people actually get taxed before complaining about brackets. There are plenty of taxes out there that have jack squat to do with income brackets, and poor people pay a higher percentage of their income towards those than many other people while also having a much higher opportunity cost per hour worked.