"Politically incorrect" seems to be relative. Politically incorrect to who? Who defines what is politically correct? It just seems like the exact same concept, only varying by which political standpoint it supports or opposes. Are we confusing this with an arbitrary standard of historical accuracy, insofar as that makes any sense for a fantasy context?
Also, what is the line between politically incorrect and just plain exploitative? If you make all orcs/goblins into vicious rapists that graphically brutalize women, then why? Is the intent to be as offensive as possible? Will trying to offend your political opponents really result in better writing than otherwise?
If I devised an aesthetic in which all men are absurdly beefy and all women are boyish waifs, in what way would that be politically in/correct?