Monopolies are the opposite of a free market. I'm not sure how a critique of using supply and demand to explain how free markets work will apply if you choose a monopolised market as your rebuttal. You may as well say that supply and demand doesn't hold under communist conditions.

What I would counter is that it that we can see that free markets work preferably to monopolised ones, or any of the other ones you've provided where selfish intervention of one kind or another has interfered with supply or demand.