Someone making the federal minimum wage working full time makes $15,080 a year. For an individual to be eligible for Medicaid, they have to make (for 2019) less than $17236.20 a year (138% * Federal Policy Level $12,490). So yes, in states that don't have a higher minimum wage, they would just barely be covered, but millions of people making minimum wage in states that have raised the minimum wage or making just above minimum wage are not covered by Medicaid. In such a case, it's better to make less money by working less rather than lose that insurance because Medicaid is great insurance while what is available at such jobs is likely garbage.

And of course, there are the asshole states that did not expand Medicaid coverage. In those states, people making such little money are fucked. The ACA may help with discounts but I doubt any reasonable insurance can be had. Hell, I can't find decent insurance through the ACA in my state and I'm willing to pay anything. Super fucked up. I totally agree that people who defend this system are assholes or idiots. No other way around it.