Why such a offensive depiction of gays?

You know, for a movie that makes a point to be open and non-judgemental of people (including the portrayal of the mother and her boss working at the "adult store", the depiction of the gay couple was offenisively stereotypical. They were prancing, prissy. self-absorbed, and just a one-dimensional reactionary portrayal that was out of line with the rest of the film. And then the main character's reaction when he was kissed spitting up as if he was poisoned was incredbly dissapointing. Especially when the actor, Joseph Cross, himself previously played gay in TWO roles (Milk and Running With Scissors). Not only did Joseph did heavy man on man kissing scenes in both, but explicitly loses his boy virginity "Scissors". I guess he's just an actor who'll do anything for the dollar.