Greg, I respectfully disagree. To me the term "political correctness" strongly foregrounds, by its very terminology, the notion of
political. It seems impossible to disentangle and expunge the notion of
politics from it, and the strong primary meaning of conforming to someone's political agenda.
Now you might argue that "courtesy" could be said to have similar resonances, since it's derived from the original idea of behaviour acceptable at a royal court, but I'd disagree with that argument. As Shakespeare knew, a politician is an ignoble self-seeker very different from a Prince, and "courtesy" evokes a spirit of chivalry, nobility and generosity which I just don't pick up from "political correctness". I think that to many people "political correctness" suggests a kind of humorless pedantic spiritless coercion which can sometimes be more anti-democratic and anti-life than that which it claims to combat.
When I think of Courtesy I think of chivalry, merriment and
Amour Cortois. When I think of political correctness I think of the cartoon mentioned in
James Booth's excellent article, where one reader says to another "I find I simply can't
touch a poet who isn't a vegetarian."