As someone who lived in China for years I always laugh at this myth, you clearly haven't traveled by crowded Chinese subway every day if you think Chinese don't stink (and they make up pretty much all East Asians).

And not to sound racist, but black people have (often) very different stench from the rest, that one is not Chinese (racist) myth.

But to be honest every race/nation I met stink, your nose is just blind to the people you meet most often. It's same with my apartment when I return back after longer vacation I can notice its specific (new) smell still even after years living there (especially if I won't leave windows a bit open for air exchange), but if I'm away just for a day or two I don't smell anything.

It's not a myth. The distinction here isn't general body odor, which everyone has, but a specific gene (ABCC11, the same that controls for wet or dry earwax). Those with the gene have a chemical in their underarms and groins that bacteria feeds on, producing a stinkier odor.

Also, I've ridden plenty of crowded buses and subways in China and haven't noticed as much body odor as Westerners. So our anecdotes cancel out there.