Well of course they're assholes. I don't know if you've realized this, but most main characters, especially in horror/sci-fi, are assholes. In fact, most heroes are assholes. The question is whether they are likable assholes. For you, they are not. For me, they are. I mean, I don't really get what you're saying, because Rufus was the most clearly irredeemable asshole hunter there was. Even Samuel had his love for Mary and Deanna, and Bobby, Cas, Dean, and Sam had devotion going for them, for a while. Rufus was an asshole to people he didn't know from adam, and who came to his door wanting his help trying to save people. He then basically extorted them for alcohol (not just moonshine, but top of line, this'll put you back alcohol). But he was so likable about it that you don't care. You clearly just like your assholes to be proud and loud.