I think it's the kind of humor that is meant to be offensive, if only to bring to light common attitudes held that are in themselves offensive. Think about how often we hear people use the term "fag hag," or even refer to how much they love their gay friends, as if it were a fashion statement, as if gays are the trend, a means to an end and not means in themselves. I think the sketch is really a mirror for the way in which "gay culture" is objectified. It isn't about the people anymore so much as it is about the fetishized lifestyle. And when I say 'objectify' and 'fetishize,' I don't mean it in the sexual way.
I mean the way most Americans typify gays as waiters, hairdressers, and interior decorators. I mean the people who expect gays to all be fun, flamboyant, shallow thrill-seekers eager to offer entertainment to anyone who would give them audience.
Those of us who know gays know it's not all parades. They are our fathers, brothers, lovers, and friends. They have depth (most of them), good days and bad days. And they're not going to have nothing to do but sit on your bed and play patty cake.
I think Tori knows this. I think she knows that most of Hollywood doesn't seem to, still. Out of the closet gays get casting for gay parts nearly exclusively, but straight actors can play gays and get Oscars. It's not a level playing field yet. And I think that is the point.
Really, what I found most disturbing was her plastic surgery. Gads! Between Tori and the intervention lady, I thought I was going to be sick.