Nice dig disingenuously implying the US isn't a first world country, it is of course the very definition of one. The term also doesn't relate to economic development. Anyway, even some developing countries have universal healthcare, e.g. Cuba.
It was definitely a dig, but I don't think he was seriously implying the US isn't a first world country. I think the frustration stems from the fact that the US is the most obvious example of a first world country, and yet still hasn't figured out how to provide cost-effective and universally available healthcare to its citizens.
yes, hence "disingenuous".
I'd go with 'sarcastic' myself - I assume he is not attempting to mislead anyone or to pretend that he sincerely believes it.
The commenter is making a perfectly apt joke about the state of healthcare in the US, as exemplified in the linked article. It is indeed a "nice dig" because it's sadly true, and Americans should all know it.
I suppose Cuba is the reason we don't have universal healthcare. If they do it, it must be Communist.
I have the feeling many Americans actually think this way.