(Spoilers for "The Audition")
Wesley wrote the script according to the credits.
I see what you're saying, but I had a little bit of a different take on it. Wesley's character (Billy) is supposed to be a fool, annoying, and a bad actor (the "hardworking drummer" gesture). His portrayal of the gay Biff isn't much better -- both of the portrayals are very stereotypical and purposely stupid.
I don't think that Wesley's intent is to mock gay people or people with special needs -- I think he's trying to mock Billy for making these poor acting choices. (YMMV, of course.)
"What was the name of that cheese that I like?"
"you can't run away forever...but there's nothing wrong with getting a good head start"
"well I hope and I pray, that maybe someday, you'll walk in the room with my heart"