Sean or anyone else confronted with a Chomsky-ite can defuse them with one simple question:
In the endless predictions Chomsky has made, what was he ever right about?
He was right when said that the policy of Ford and Carter aiding the Indonesian Moslims slaughtering the East Timorese Christians was an evil policy that would come back to bite us. He was right to point out that the liberal media, the NYT in particular was manipulating the news.
Chomsky used to be a little unpredictable, but in recent years he has just turned "bitchy". E.g., his response to a well reasoned argument of Chris Hitchens was to call him an alcoholic, etc.