Best thing you've ever said Ben.
It's actually not Jason who's the biggest culprit here - I could easily point out someone else from this thread who ... naaah, I won't go there, it's too easy.
That said, I don't think Jason would fall into the category either. I haven't actually had the pleasure of being stuck in a group of them (or meeting one, yet), but in my head, I could totally see them talking out of their ass...and Jason just tends to do that when joking around.