South Park would be the show to make fun of the alt-right, however if only for the alt-right tastelessly taking itself seriously.
Also PC Principal on SP is a good comparison, because if you listen to the dialog at the end of the season carefully, PC Principle is re-framed in non pejorative terms. His "PC Power" is even referenced as a positive character trait, which is merely being abused by the real villains who wish to use him for their own ends.
Going off past history I'm not even sure how the alt-right could grasp the character. The combination of exaggerated political correctness and man-tastic, bro-slapping, face-punching ham fists that alt-right guys imagine they see in the mirror, seems likely to trigger an aneurysm.