Pretty sure there is one character in the game with jann (the gay lancer's name)-hater or something like that as a potential. I've never used jann very much though so I don't know what sort of dialogue you get when the potential activates.
I also want to point out that there is a fair amount of male characters with the "fancies men" potential, and females with the "fancies girls" potential (and a few with both fancies men and girls), and many of them don't sound very stereotypical.