I tend to notice that those offended by these types of things tend not to be in the groups that are supposedly targeted. They're looking to be offended, not reacting to a specific offense.
I had no problem with this joke whatsoever and I'm in the supposedly affected group. Is it not worth examining what the closet does to people, including through comedy?
BROADWAY: The Cripple of Inishmaan, This is Our Youth, If/Then, Hedwig and the Angry Inch (x3), Cabaret (x2), The Real Thing, A Gentleman's Guide to Love and Murder, Chicago, Les Miserables (x2) Disgraced, Finding Neverland, On the Twentieth Century, Wolf Hall Part I, On the Town, Fun Home; TOURING: Jekyll and Hyde, The Book of Mormon; LOCAL: The Twilight Zone, Anne Boleyn, Death and the Maiden, The Lying Kind, Chorus Line, Stupid F**king Bird