Blazing Saddles is described by many as politically incorrect, but I have never accepted that. It is stealthily very politically correct most of the time, although I don't hold it against the film. It really couldn't have been anything else.
The film uses the "N" word a lot, but everyone that does is made to look like an idiot. The racist townspeople are laughed at. Only by shedding their racism do they gain a sympathetic treatment. Everyone who remains racist receives their comeuppance. The only politically incorrect scene that I see in the film is at the end, when the riot breaks into a gay musical Hollywood set. There, the gay actors and director are portrayed stereotypically and somewhat negatively, although not completely unsympathetically.
As an aside, this scene is terrific in that I never fail to start caring whether they get the take right, and then we crash back into Blazing Saddles, and I think, "Oh yeah, I was watching a western."