Personally, I'd consider myself rich. I live in Germany which is already among the richer countries in the world giving me access to an insane amount of infrastructure and opportunities. Furthermore, I work for an IT company and make more money than average and more than I need to satisfy my immediate needs (shelter, food, transportation etc.) and pay for my hobbies (mostly outdoor stuff). I might not be a millionaire and I can't just retire tomorrow but still I'm very aware of what a huge privilege I have compared to a vast part of humanity.
Personally, I think already my taxes are too low. Not to start about millionaires or billionaires.