My suspicion is that the Novaks are from one of the evangelical Christian denominations that think everything not Christian, by their definition of Christian, is Of The Devil. The target market for Christian romance and Christian rock, in other words. My evidence: demons and angels as a rule have very little trouble with pop-culture references, only exceptions to mind being Zachariah's WTF at the Suite Life of Zach and Cody reference and Castiel's WTF at...everything, really. Zachariah's vessel's not exactly the target audience for Suite Life, so if Zachariah's vessel hasn't got a kid who watches Disney Channel, odds are Zachariah's vessel wouldn't know jack about Suite Life, while still knowing all the references Zachariah has made or gotten. And we know Lucifer had no trouble with hearing what Sam was thinking. So if Zachariah only understands decoupage and Gilligan's Island and 'Elvis has left the building' because his vessel does, and Castiel doesn't understand anything about pop culture, it follows that Castiel's confusion derives from Jimmy's. Which means Jimmy's life has been fairly isolated from pop culture, and since we know he's some flavor of Christian and we know there are Christian groups that stay as far from pop culture as possible...