The same things have been bothering me about this wank, to the extent that I started researching profanity and insults, to see if there were any gender neutral epithets that Dean could believably have used against Ruby to achieve the dual goals of infuriating her and expressing the depth of his own distrust and loathing. If he were British he could have drawn on a rich history of invective (one reason Bela so outclassed him in their "witty repartee"). A religious Dean could have referred to her as hellspawn or a thrice damned soul, if that weren't just a literal description instead of blasphemy. A literary Dean could have stolen wonderfully colourful epithets from Chaucer, Shakespeare or Dickens. If this was "Deadwood--the Supernatural Edition" a huge range of scatological and sexual expletives would open up. Dean's options for swearing are severely limited by his network, his education, his disposition, and his nationality (there are no entries for American English in the alternative-dictionaries.net collaborative project for collecting bad language from around the world--that's rather sad).