People want spaces about a certain topic. It makes sense that people then "censor" things that don't fit said topic.
Even if that topic is "Be kind".
Just as with "free speech" in real life, online there are also limitations. If you disagree with those limitations, you have the freedom to go elsewhere. If you find that nowhere fits the kind of place you want to be in, make your own.
Just as people don't have to tolerate being around others mouthing off in their face, so to can they take steps to avoid/prevent that online.
In my opinion, people that can't fathom that concept are the ones most in need of that oversight.