Politically correct people often lack the most basic common sense and are looking for problems where they aren't any. There has never been any hostility from the gimp team towards physically disabled people.
They actually forked the software after getting this motivated negative answer to their repeated requests for chaning the well known and popular application name. If they really wanted to improve the UI (which wouldn't be a bad thing imho) they could have contributed to the project instead of forking it.