My impression is that libertarian communities, similarly to Mensa, have more hostility between members than you might want to see in a well-functioning community. There are libertarian communities, but they are less community-like than the term would lead you to expect.

That might be directly related to the kind of person who joins a libertarian community (as seems to be the case with Mensa), or it might be an artifact of the fact that women hate libertarianism.