Thing is, how far is enough? If someone uses a rape joke on a fox card, then the UFC would be paying for it a lot. People try and find a way to make MMA look bad, and UFC doesn't want to hand them a golden platter.
On note of sponser pulling out, I think it's plain stupid. I'd someone is watching a fight, they are more likly to grab a bud light because of the huge logo in the center or the commercial, heck even the bikinis during UFC 132.