"If you don't agree, I'd like you to name me one modern, affordable, fully privatized health care system."

GERMANY - for one! Germany provides cheap, efficient health care for everyone with considerable flexibility and choice and therefore public popularity through a mixed system that has at its heart private (for profit!) health insurance.

There are others.

The way one distinguishes passionate advocacy from ideological extremism is to examine whether the speaker attempts to portray their favored approach as the sole orthodox choice and dismisses the very existence of obvious counter-examples as non-existent ("fake news").