>> so many of your citizens without even basic affordable healthcare
> They aren't. Anyone can go to the ER, and if you're poor it'll be billed through Medicaid.
You guys are both wrong, and arguing with broad brushes about something that's complicated and subtle.
Health insurance is available to everyone in the country, but it's expensive and extremely complicated (among other things: you don't "bill through" Medicaid and lots of folks who qualify aren't on it because they can't figure it out).
It's true that the pre-ACA world where getting sick without employer-provided insurance means dying poor is gone. Almost everyone who needs serious care in the US gets it in some form, but lots of care is delayed because people aren't covered, as getting covered is "affordable" but extremely expensive (unsubsidized family plans run $20k/year and up!). It's much better than it used to be but not a great system.
The flip side is that it's also true that the large-payer corporate insurance system provides "better" care in the sense of access and outcomes[1] than the state-run systems in Europe. It's extremely rare in the US to hear the "on a waiting list" stories about elective care that you hear especially in regard to the NHS.
It's complicated, basically, and not well-suited to yelling on the internet.
[1] Obviously the system pays for this with much (and I mean much) higher service rates than the rest of the world extracts for the same care. US doctors and health systems do very well.