he told me the price in US dollars, but the weight in kilos

yeahbut® I'm a younger generation than Uncle Rodney

fwiw, I did all measurements when building my house in metric, from m3 of concrete to running lengths of timber (lumber to my yankee brethrennsistren). All my work life is measured out in metric coffee spoons too

And I buy petrol in litres, drink wine by the litre (believe me) but I still know all the imperial guages too. I was of the inbetween generation, in some ways, I guess. The only one I have to still make any conscious effort at is temperature - sure, I know 28 = 82, but I know what 52F or 64F or 93F feels like on my skin...