There are rich areas and poor areas, touristy areas and off-the-beaten-path areas. But in US retail you won't find sellers discriminate based solely on the look of the customer in 99% of cases.
The USA only does this for trivial unnecessary frivolities like medical care.
That physical separation is maintained by the actual physical class separation along policed municipal boundaries that exists in the US.
Developing societies instead use walls with barbed wire and hired security for that function.
That said, there are pretty strong correlations between the tier of the grocery store and the appearance of their average customer.
And yes, there are wealthier but frugal people who shop at cheaper stores, but they are an exception.
This happened to us in multiple cities (NY/Miami/SF)
That's true of my friends and romantic partners of all races by the way. I can't think of a single time I've seen someone be given a racial discount here.
There were a few times at restaurants and grocery stores where they had access to items I wouldn't have, but that almost always came from speaking the right language and knowing what to ask for. I'm sure those places would have been equally happy to accommodate me if I know what to say.
I do have stories of those friends and romantic partners being discriminated against a few times.
But I also don't go out often, and if I do, it's just to eat usually.
Ironically, we still paid less out of pocket for that week-long hospital stay without insurance than we would have paid for a single day hospital stay here in the US with insurance.
So, overall, we were pretty happy about the amount we were paying.
I'm curious about this one. I've been to the hospital one time in my adult life. Stayed overnight, got multiple tests including an Xray and an MRI. Got medication, etc.
Having heard the horror stories I was ready for a big bill.
It was like $140.
It was cheaper than a hotel room would have been.
I can't tell if I just have exceptionally good insurance or if people who make a big deal about the US healthcare system are leaving out critical details.
The cost of an MRI (starting at $400, going way up depending on what was MRI'ed)[2], xray (starting at $100)[3] and an overnight stay (around $2600 non-ICU [4]) would be at least $3100 alone if you had to pay everything out of pocket, not accounting for any additional costs (the unspecified "additional tests" you mentioned, for example, or things you haven't explicitly mentioned but may still used like an ambulance ride, etc).
Of course, this is recent prices, and the prices may have varied when you actually were in hospital, and it is my understanding that prices both for health care services and procedures, and health insurance can vary widely depending on the region and the providers involved in the US.
But my google-fu let's me conclude that you indeed extremely likely had a health insurance plan at "platinum" level, far better than what most of your fellow citizens in the US enjoy.
Somebody with a plan near the "median deductible" would have paid that median deductible of more than $1400 in full, or around 10x what you had to pay, somebody unlucky enough to be on a "bronze" plan might have had to pay the full amount (or at least around 7 grand), and there are about 31 million people in the US without health insurance[5] who would have had to pay in full.
(Please note that I, as somebody who never experienced the US health care system, can thus only provide an outside view based on what I heard from people I know and in the media, and googled)
[1] https://www.investopedia.com/how-much-does-health-insurance-...
[2] https://www.itnonline.com/content/mri-costs
[3] https://health.costhelper.com/x-rays.html
[4] https://www.debt.org/medical/hospital-surgery-costs/
[5] https://www.statista.com/statistics/200955/americans-without...
The lowest would be the dollar stores, but then you have food stamps, and food banks which are like free supermarkets in a sense. If you can’t get to them then there’s soup kitchens and quite a few charities that will bring food to you. We can definitely fill in more cracks but there are a lot of available food sources in America.
The same thing happens in developed countries like the US too. It's just done a different way: We have high end grocery stores and low end grocery stores, and ones in the middle, each catering more or less to different social classes.
If you are really low on the totem pole, you may have no grocery store.
Although they differ in the quality of food they offer, there is significant overlap also, which is priced differently.