Hogwash. Neil was trying to tell O'Reilly, in as nice a way as he could, that when O'Reilly bought his Enron stock he most likely didn't know what business Enron was in. He (O'Reilly) had not done the "due diligence" that he should have, therefore he should not be surprised if he lost his shirt.
Investing ain't beanbag.
BTW, betcha Cavuto didn't lose money on Enron.