The person is not wrong about Greek Philosophy. Have been reading some of Plato’s works and he does have a bit of an absolutist way of presenting things that sometimes fails to address the nuance. The things that he is right about though transcend time and are eerily relevant to our current circumstances, so his thoughts on him an nature tend towards accurate. On this example, Plato would probably script Socrates explaining to Glaucon, and indeed does, that vision is tied to brightness and darkness and that somewhere in the middle is where you’d want to be because brightness is brought by the sun, which is hot, but you can be tool dark and cold in a cave. He’s then be ADHD and explain that the cave is a metaphor for our knowledge and since light lets us read, we lack much knowledge when being in the dark. Glaucon would then quip that people can still talk in a dark cave and that their voice might even be echoed and Socrates would probably say that without the warmth from light, the soul won’t listen to the loudest voice. It goes something like that.