Over 10-15 years of Mudcat, I have seen numerous Brits make 'remarks' (often critical) about the USA or its policies, characteristics, attitudes..etc. In most of those remarks I detect a basic unfamiliarity or lack of comprehension of just how large & diverse this country is!
Yes.. I know... the UK is quite diverse also: but the differences are not so large when carefully considered. The UK has a variety of dialects, food preferences, music, etc...etc... but because the country is fairly small,they mostly seem to recognizable to each other.... and there are 800-900 years of history to 'set' many concepts.

It is hard to comprehend how varied and widely separated US places & people are. It is only in the last 100 years that relatively easy travel was possible... and regional differences were even more extreme until paved highways and radio & TV in the 30s, 40s & 50s made it possible to really 'share'.

The USA, due to distance & the way the Constitution was worded, has this history of "states rights" that further serves to avoid 'being like THEM' (up there-down there...etc.)

Sometimes I think the image of "herding cats" was invented to characterize the effort to get Americans to agree on anything.