I think it depends on where you grew up in the USA?
I was incarnated in California as a human in the 1970s this go round and was definitely taught metric and other measurement systems in public school.
Attached is a road sign example from California which has both mileage and kilometers listed.
Albeit, this may have varied somewhat. For example, while I was taught Fahrenheit and Celsius in public schools when I was younger, by the time I was taking Physics at a private high school, I also learned Kelvin.
I'm not sure where Corgi measurements are taught, but I graduated from University in 1999, so it might be a new thing? Speculatively, probably promulgated by Cowboy Bebop Ein fans. Grateful to have one reference point now at least!
Hope I won't have to use it often.