By "single offensive word," I was not dismissing context (though I agree that some words would be offensive in almost any context today).   I simply meant a word which, when included in an otherwise well-received song, would kind of "poison the broth" - i.e., turn a lot of people off so much they would tune out the rest of the song.    If you can take that one word and find an acceptable substitute that fits the song and doens't offend, that's what I mean by a "single offensive word."

For instance, the state of Kentucky has substituted the word "people" for "darkies" in their state song, "My Old Kentucky Home."   Personally, I prefer "... 'Tis summer, the honkies are gay ...," but perhaps my caucasian bretheren and cistern may find that offensive.
So I usually sing, " ... the folks are all gay ... "

Of course, that offends the Christian Coalition ...

(Can't win, can ya?)