When I was young, we did a unit in Japan in school. I remember specifically that white cars were a thing. Like virtually every privately owned auto in Tokyo was white.
As the owner of a white car I can attest that they show the most dirt easily.
Matt white is the most popular color for governments and businesses because it's the cheapest to buy and the cheapest/easiest to fix by yourself when scuffed (I fixed mine with a 2 Euro tippex like marker from Amazon).
Metallic/perlescent paints are far pricier for buying and are a nightmare to maintain and fix when scuffed.
In Europe, the white van is the workhorse of every business.
I had a couple black cars and currently a white one. Imho, black is much more susceptible to dirt, even the lightest dust is visible immediately. White is quite a bit better but still needs a wash every now and then. And then there's "silver" aka light grey, that never needs a wash at all pretty much.
White paint also doesn't fade. It can still look worse as it ages, of course, but it's still white. Red cars don't stay red, and neither do black cars, but white cars are still white (or white with road grime)
