Talk:Derpy/@comment-4656186-20120202220901/@comment-64.69.158.250-20120202223349

From TVTropes:

"Despite this, some fans are not happy with using "Derpy" over "Ditzy", her voice, or her klutzy nature, which all give her the appearance of being mentally challenged (the word ableist has been tossed around by some). It has been noted, however, that the episode's writer, Amy Keating Rogers, does have a mentally disabled son, and thus would be sensitive to such issues, according to this apology from the community to her ( http://derpyhoovesnews.com/thank-you-mrs-rogers-studio-b/ ). Sisby, one of the storyboard artists, states that they storyboarded Derpy as an "accident-prone klutz" and never as someone mentally challenged ( http://sibsy.deviantart.com/journal/Derpy-Backlash-282491737 ). Furthermore, as explained by Tabitha St. Germain ( http://www.equestriadaily.com/2012/01/tabitha-derped-thought-derpy-was-male.html )(the actress that voiced Derpy), she created Derpy's voice as an "endearing" take on a local boy that wasn't disabled, just sleepy, klutzy, and a slow speaker."

That's why.