They want to change Derpy's name due to some people having found it offensive. Apparently, Derpy is a slur against mentally disabled people. But we all use it (I hope) as just an expression of something funnily silly or stupid.
We all have a little bit of Derpy in us, I like to think. So please go to this petition [link] and sign to not let them change Derpy's name. Because we love Derpy and Derpy loves muffins and there can be no muffin love without Derpy!