That would require reading every post, which is impossible.

Understandable, then I guess you could just do it for this quote chain? Do you really want a crackpot pimping his personal site and cause? You'll just be putting out more fires with other people later, and you still won't really know why they're cropping up.

Maybe instead of just calling it a crackpot site, and attacking the commenter, you can refute the content that's been linked.

Much harder to argue against a well-reasoned response than personal attacks.

Re-read the comment thread, the person I'm "conversing" with can't even keep it straight when he's talking about Wikipedia, the Mayo Clinic site, or his special "site".

And have you actually read over his site? No offense, but my time isn't significantly less valuable than yours, so if you want to spend that kind of time, be my guest.