I’m one data point, but I lived and spent my childhood/adolescence in the UK - not solely on military bases, but it villages and towns such as Standlake, Oxon, and Hopton, Norfolk. So in many ways we could get a little America on base but we more or less grew up acculturated in Britain.
There was a ton of racism in the UK in the 1970s and 1980s. Here in America, too, but I’d never been called “wog” or “jungle bunny” over here. Yes, I’ve had a racial slur here and there, but if you were a person of color in the 1970s and 1980s it was almost casual in Britain, whereas in the US people are shocked if you deal with that kind of abuse in shopping centres, etc.
But I will say that the Brits that we met one-on-one tended to be the warmest, most giving people on earth. Especially older Brits who remembered the war - we would have people in the village stop by and say hello, and share a story about a Yank they knew years ago.
I left the UK in 1986 and I’ve been back three times, each time staying with friends and family. Not so much a tourist but more of a homecoming. Hands down, I think the NHS is a great social net. Most of my friends are professionals but still get most of their care on the National Health. You also have much better public transport, from buses to trains. Regionally we have hotspots - Boston, NYC , Chicago - but most Americans need cars because public transport is so poor. Then again, we’re much bigger. As a lad I’d have thought traveling from Oxford to London as an epic commute - I have colleagues who commute that distance daily.
I think it’s much easier to make a living and the cost of living is much lower in America. Most of my professional friends would love to come over to America and live for that reason (of course, home, family, etc. factor heavily). I’m probably the opposite - I would love to live in the UK but I don’t know if I could afford to. It’s really expensive, especially for what we consider to be middle-class living.
I do agree you see much more vivid extremes here in America - appallingly poor and appallingly rich, but those are the tails of the distribution. But social and educational mobility make coming from meager beginnings much more possible. Having compared notes to friends who did O and A levels to get into uni, I know there’s no way in hell I would have gotten into a prestigious uni in the UK - but I did here in America. And that’s not to dismiss the myriad problems we have here with racial/socioeconomic/immigrant bias and discrimination, but I do think bright, hardworking people have the best shot of “making it” here than virtually anyplace in the world - regardless of where you come from.
I think the flag-waving thing is quite interesting. I remember Morrissey getting tons of stick about wrapping himself in the Union Jack in the 90s, and while there are plenty of kooks who like to cloak themselves in the stars and stripes, fire automatic weapons, and wear camouflage, they’re outliers. I have a fairly neutral view of the flag, trending towards the positive.