This is the definition of censorship;
Censorship is the suppression of speech, public communication, or other information. This may be done on the basis that such material is considered objectionable, harmful, sensitive, or "inconvenient". Censorship can be conducted by governments, private institutions, and other controlling bodies.
Would you also be happy to accept posts/comments of a racist/homophobic/vulgar nature, as that's what things could revert to, without some form of censorship?
I don't think you would, and as I said, I don't consider such restrictions as 'censorship' (although you obviously do), merely as a set of guidelines/rules which prevent such occurrences.