But if it had been "Why are Morris Dancers so fat?" it would have been equally untrue about quite a few Morris Dancers, but I doubt very much if there'd have been many people getting upset. It wouldn't have been seen as an insult of any signifcance, or even as an insult at all.

Or, I suspect, if it been "Why are Australians so fat?" Or Tongans for that matter, to name a country where being fat is considered a good thing, on the whole.

I rather like the term "traditionally built", which is the term used in Alexander McCall Smith's excellent series of books set in Botswana.