You know, I am reminded of the thread about a children's rhyme.
eeny meeny miney mo
and what do we say for the rest of it
apparently, it was once a racist rhyme. I don't know what the word was, but I can guess.
Once upon a time, that word was clearly so unremarkable, that people thought nothing of making it part of a children's rhyme to pick who's 'it'.
If I inserted that word into a sentence in my post here, I bet it would leap out at everyone and all would be shocked that i thought it was ok.
That's where we need to be with words that are used as insults because they indicate disability.