Fia doesn't dislike Feradi, exactly, although maybe if he were in the habit of disliking people he would. Feradi is rude on purpose, mean on purpose, just to prove he can be. It's unpleasant to be around.
But Fia can't really fault him on the philosophy, given the givens. And anyway, he's probably nicer when he's at home, when he's not flaunting his contrast with Cretari citizens.