I have a mentally retarded aunt, and she sounds nothing like Derpy/Ditzy. Also, I'm not offended by it either. Yeah there are those who perpetuate ignorance and don't know what derpidity actually is, and Hasbro may very well listen to them for possible business related backlashes, but aren't there other nods to bronies, like Equestrian Girls and the whole Ponyville being nudists thing? Either way, I think we'll have other acknowledgments, and it may be a difference of the times when it comes to past cartoons with similar characters...possibly why we aren't offended by it. It is interesting how they refuse inclusion of all types of people (whether it was their intention or not) by excluding/censoring them from a show...kind of antithetical of the general message of the show, as well as not trying to expose children to something they will encounter at some point in their life anyways, but I think I put more than 2 cents in so I'll shut up.