Its not just parents who don't like the name/speaking portrayal. A lot of fans also dislike it. Personally, I can't stand the name and hate how she was portrayed. There were tons of arguments and fights on MLP Arena to the point that the name was banned, and still is, but I don't know if anything went down here on the TP. I don't want to get into why because its such a can of worms and I'm used to talk of it being banned, but yeah it can be a negative word (especially when combined with the speaking scene, her voice and the characters' actions). The word doesn't bother me as a whole but I don't think its an appropriate name for a character in a children's TV show/toy line.
I call her Bubbles/Bubblecup, after a
G3 pony. Its a lot nicer than Muffin/Muffins or a muffin drawing imo.