Wow, this is embarrassing. I took statistics, but it's been almost a decade. I got a pretty nice review on Bayes' theorem in an AI class I took last year though. I thought I understood the xkcd comic quite clearly, but I'm completely lost on the posted article.

Apparently, Munroe was a bit confused also.

>The truth is, I genuinely didn’t realize Frequentists and Bayesians were actual camps of people—all of whom are now emailing me.

http://andrewgelman.com/2012/11/16808/#comment-109366