Snippy, xenophobic, and snobby in equal measure, I see. You're entitled to your opinions of course, but your salient "well known fact" may well be a fact that exists in the popular imagination only. Or possibly only in your imagination. It's very much a spawn of the theory behind the "Special Relationship" - that the British are the sage Greeks and the Americans are the brash, rash, and only moderately educated Romans who need careful guidance.
And you're also coming across as weirdly loyal to Chris Martin, who appeared to be having the time of his life at the Bal, and either came up with the idea of naming his daughter Apple or went along with it eighteen odd years ago.
Let me guess, you don't like Gwyneth Paltrow? If she was so fascinated by European culture, class, and society, she could have done much, much better than Chris Martin.
I'm not sure when you last visited, but imo the Cotswolds have been a parody of British country life for a long, long time, and not because of American blow-ins.
The Bal's invitee list is not supposed to reflect the times we live in. It's designed to make wealthy people from all over the world part with their money. None of the society dish of any trashy /fashion mag is supposed to reflect "the times we live in". Its content is supposed to be an escape from the times we live in, and its aim is to flog pricey sunglasses or youth in a jar, or whatever, not to advertise nail fungus cream or bogo deals in the local supermarket. Did you think it was supposed to reference your life or mine?
As for 'highly manipulated guest lists', check out how you get invited to the Queen Charlotte Ball. It looks like a cut price version of the Paris hooley.