Unpleasant words are a part of life. So are deformities of the physical and mental kind. I don't believe in censorship of any kind. People should be respectful, but it is a person's right to use whatever language they deem appropriate. This is coming from a person that doesn't say "retarded" or "gay" in negative ways.
I agree with you in princinple, and I don't support censorship either. I just don't think it would be a bad thing if more people decided to be respectful toward others in their use of language.