Earlier quoted context omitted.
Chomsky had stated earlier that there are experts to read who cover such things. The kid kept asking variations of the same question. If I were Chomsky I would have been done after a couple of responses.
"These 'experts' agree with me" is not an argument. Indeed, clearly Chomsky did not want to engage the argument so ceasing responding would have been logical.
What's your point in saying so? I would guess that Chomsky could care less about winning an Internet "argument" with some random dude. From his point of view, it's entirely reasonably to say "go read the literature and come back when you're more informed". If the other party doesn't want to do that, they have no moral claim to Chomsky's continued participation in the discussion.