I can see taking offence, as they also seem to be pointing at transexuals as "haha funny!" The same way sixth graders feel about fat people.
But then again- Michael Moore is a huge ####. So, when I saw the sketch I saw it more as making fun of Moore's reactionary, based-on-his-own-opinions-and-nothing else style. An exaggeration of his ass-ness.
Of course, we're also talking about Robot Chicken, where nothing is sacred and if you haven't seen offensive material you haven't been watching. I would think it's hard to take it as serious bigotry or anything like that, seeing as how pedophilia is a regular topic and I doubt anyone is claiming they are pro child abuse. It isn't an editorial piece, a raunchy comedy show. Hard to take any part of it to heart.
Ninjas, gladiator midgets and Orson Welles- it's a Godrey Ho-mage, only at NinjaTheMissionForce.com.