They are spending $$$ for pictures of anthropomorphic monkies and pizzas that are small variants of similar pictures; that's pretty irrational.

That is no different from expensive picture collectors. That's a minority of participants.

Expensive picture collectors may also be irrational ...

The point is not that they are rational, but that you can't deem the whole crypto market irrational (what the parent does) just because it has NFTs, because then you'd have to deem the regular market irrational too because it has picture collectors.

Both markets have some degree of irrationality, and the parent did not show that cryptos have more of it to justify preference of the regular market over crypto.