Obviously, the librarian is lacking in manners. A southern grandmother would wash her mouth out with soap for sending such as nasty letter, rather than a gracious thank you note.
Calling someone racist used to be a terrible thing. However, Demmies have over used the word to such an extent that it has little meaning anymore. Equating Dr. Seuss with a KKK cross burning is ridiculous to anyone possessing a modicum of common sense.