They have a very simple idea of market mechanics with very simple ideas of market manipulation.
If our market isn't working, it's just not "pure" enough, right?
https://en.wikipedia.org/wiki/Anti-competitive_practices
https://en.wikipedia.org/wiki/History_of_competition_law
https://en.wikipedia.org/wiki/Natural_monopoly
https://en.wikipedia.org/wiki/Tacit_collusion
https://en.wikipedia.org/wiki/Regulatory_capture
https://en.wikipedia.org/wiki/Tragedy_of_the_commons
I don't think OP has read very many books and I would be surprised if they have a bachelors degree. OP reminds me of myself during Ron Paul's "the free market solves all problems" period on Reddit. Ron Paul presented a very simple idea of how things work, but once you start to think about how those ideas don't work, it's obvious that ignorance is being taken advantage of.
Alternatively he did not respond to the best most charitable interpretation of the post. Simply put: OP's ideas wouldn't last (and aren't lasting) long outside of an ideological echo chamber.
I think a strong obvious argument against a "less regulation" panacea is that we couldn't make our own masks because the free market sent all the production to China. Sending all of our manufacturing to China because they offered the best deal gives china incredible leverage over us. Clearly the "free market" must be analyzed not just in terms of supply and demand, but also in terms of power and coercion. There is no supply/demand curve for power.