I’m glad they do, or I wouldn’t realize that some people think Blazing Saddles is “One of the greatest conservative movies of all time!”
The basic problem with conservatives claiming that Blazing Saddles is a conservative film, rather than an anti-racist film, is that it relies on conflating political correctness with liberalism and political incorrectness with conservativism. Political correctness is an ideology-based concept that varies by ideology, for example Conservapedia has nearly completely banned the use of certain terminology (e.g., the near-total ban of the acronym ‘BCE’ and the word ‘fuck’, the latter excepted in rare cases when quoting people they hate) and the banning of certain concepts such as support of evolution (despite it being supported by the Catholic Church since 1950). As the film itself demonstrates, one can use ‘politically incorrect’ terminology in the service of a larger lesson.
They also hate ligatures, which is why I always refer to it as Conservapædia.
Anyway, RationalWiki provides a thorough exegesis of the movie, maybe too thorough — it’s the place to go if you need every single joke in the movie explained. Like if you’re a right-wing “comedian”.