If you watch his in-depth reporting and investigating professional protestors, he finds them at protest rallies, asks them questions and let them give their full explanation. The whole while as the progressives or communists are talking they're defeating their own argument.
One of my recent favorites, Nate interviews a communist protestor at NYU campus and has them explain their whole view, then asks them for some literature. Then the communist protestor tries to sell them a communist newspaper and brochure. When Nate asks, "wait, why do these cost so much?". They say, "well, it costs money to make these". Classic!!!