It seems to me that the term "politically correct" is frequently used as a way of re-categorising ways of using language which are basically about good manners or courtesy, and labelling them as a variety of etiquette.

There are occasions when there can be some validity in that - people who try to operate a mechanical and arbitrary rule book as part of some exercise in organisational politics. But those are the distortions and exceptions. Mostly when people brandish the term "political correctness" (overwhelmingly in order to denounce it) what they are in fact attacking is the exercise of good manners in language.

Here's a song about all this I once wrote and posted on the Mudcat, and called "Poison in Jest":

Now there's a funny way of talking called "Politically Correct" -
Silly fools who think that words have some kind of effect.
Now that's surely not a notion that's entitled to respect -
So I'd like to poke a little fun at this strange dialect.
For when I meet some oddity I like to speak direct.
No, I never mess around with being "Politically Correct".
So I speak to them direct, that's what they must expect -
No I never mess around with being "Politically Correct."

So I say "Good Morning, Mr Nigger!",
or "How goes it, you old Yid?"
The answers that I get, I find surprising.
And I like seeing tins marked "Cripples",
or "For Little Spastic Kids" - I think euphemisims are so patronising!
So I speak to them direct, that's what they must expect
No I never mess around with being "Politically Correct."

So, perhaps you are a Poofter, or a Gippo with a van,
or perhaps you are a Mongol or a Moron -
or perhaps you come from Essex, Essex Girl or Essex Man,
and perhaps your name is Tracy, Wayne or Sharon
Well, I'll speak to you direct, that's what you must expect -
No I never mess around with being "Politically Correct."

If I call you what I choose, what's that got to do with you?
It's not my problem if the words appall you.
It's how I always speak when I'm talking to a freak,
and it doesn't really matter what I call you.
Yes, I'll speak to you direct, that's what you must expect -
No I never mess around with being "Politically Correct."

And if anybody says that I offends,
why then I just assume an
injured look - my poor little friends,
you must have lost your sense of humour.
And a sense of fun, when all is done,
it never should desert you.
And sticks and stones can break your bones -
but words can really hurt you.

So, I'll speak to you direct, that's what you must expect -
For I never mess around with being "Politically Correct."

Now some might call it courtesy,
or politeness or respect -
But I prefer to call it "being Politically Correct".