I have always liked Penn and Teller as performers, I occasionally watch "You fooled me" and particularly enjoy the insight they give into their tricks such as this very nice interview about the red ball trick.
BUT, as skeptics they have always rubbed me the wrong way. I can not watch a single episode of Bullshit! They seem to me to be Show Biz people first and skeptics second; not above preferring a personal stance or populist argument in favor of solid science and certainly exaggerating, albeit true, facts to favor pizzaz instead of level headed critique.
I am fine with their choice of this style and far be it from me to demand anyone be right 100% of the time, but when confronted with the thruth the correct course is to own up to your mistake. It is a sign of self delusion if not outright hypocrisy to qualify or evade the issue when apologizing for your mistakes.
This piece explains the issue quite more extensively and eloquently than I can.
I thought to bring it up since both Rym and Scott (as well as many forumites) are fans of P&T particularly for their efforts with skepticism. Getting unambiguous issues such as global warming or smoking wrong is remarkable, non-apologizing is unaceptable and makes them assholes in my book.
And unlike saying "I was wrong" after having been wrong; emphatically saying that you are an asshole after having been an asshole does not make it OK.