As I say, they are already paying 12x more tax than someone who earns 4x less.
This isn't an argument. Stop saying it. It's a quirk of statistics. People are taxed on a percentage of their relative income. Then using the absolute value to determine fairness is complete bollocks because we've already determined that taxation fairness is decided by relative incomes by the very measure of every economic system used by humans on the globe using a relative tax system.
It's really, really, really, really dumb point to make when you're making other intelligent and semi-intelligent points.