Many funny things are offensive to somebody. Often goes with the territory. Think Daily Show/Colbert/Bill Maher. And needless to say, it's all subjective.<quoted text>
You should watch the sketch. It was dumb IMO. Though there was an interesting discussion on whether donkeys could really be fellated or not (Hughbe??).
If done better, it would of been offensive. In the greater picture, it does buy into stereotypes. But I think they bungled it by poor writing.
Had it been funnier, it would have made it to air. God knows (!) enough of what does make it to air isn't too funny. I record SNL regularly and fast forward through about half of each episode.
I'll be waiting to hear Huggybear weigh in on the donkey question. He's our resident expert in such matters.