You could always use the metric system, that was always allowed. Most food (I've seen) has both imperial and metric measurements. Most digital measuring devices and lots of analog ones will have options for both. Speedometers generally have both.
Really, the only one stopping you from using the metric system in your daily life is you. Unless of course you're saying you want other people to use it. Which is a distinctly different proposition.
I'd argue the two greatest barriers for the average, non-STEM individual adopting metric in America is the speed limits being in mph and the temperature being in °F. Both are convertible easily enough, but when you constantly have to do so to engage with critical infrastructure or safety (cooking temps, etc.) It provides a barrier against adoption for anyone without the drive to make a concerted effort to use metric.
In the UK we're mostly using metric with the odd exception (we still love a pint of beer), one of which is that speeds are measured in MPH. It's not really a big deal, there aren't many customers between miles and kilometres and anything less than a km is still usually measured in metres.
Sorry, I thought you were making a general comment. I didn't realize you we're criticizing the "metric money" statement.
But, reading over that person's comment again they also say "centidollars", which also doesn't exist, so I believe they were trying to make the point that the US was the first to make a currency that seems to adhere to the same principles as the metric system since their currently since 1 centidollars = 1 cent = 1 dollar/100.
(I'm pretty sure it was a joke though. We don't use kilodollars, etc)
Non-metric or non-decimal money is referring to systems where the multiple tiers of money, like our cents and dollars, are seperated by amounts other than 10 or 100, like the old British system of 12 pence in a shilling and 20 shillings in a pound
https://en.wikipedia.org/wiki/£sd