What a bizarre reaction to my post. Watterson’s complaints about modern art, for example, are conservative, and it is people on the other end of the divide who might be turned off by that. Watterson in the mid 1990s was an aging Midwestern white male, and some traits of conservatism are exactly what one would expect from that demographic.
The political views in Calvin and Hobbes, where they exist at all, are much more in line with 60's counter-culture: anti-consumerism, distrust of authority figures, labor issues. Where there are right-leaning references (e.g. "Commies") they are mocking. Think Colonel Flag in MASH.
My reaction was not bizarre, I live in a deeply red place where at least once in every social gathering I get to hear some harp about "the media" or political correctness, so I know it when I see it. It is amusing because it is so enshrined in "modern" conservative culture (well, not so modern, it started in the early 90s...) to complain about this that it creeps into everything.