On edit: You know, this is a serious issue, and it warrants more than a flippant response, although I still stand by my response.
The ostracism of certain beliefs as a matter of course strikes me as totalitarian in its basic premise, that some ideas can be dismissed out of hand because they are unpopular or considered "unenlightened", is the modus operandi of political elites throughout history. It is used to discredit those who hold contrarian views, even when those views turn out to be right, and is a call to bullying, abuse and ad hominem attack instead of reasoned argument. The end result is that anyone who disagrees with a liberal is called a Nazi or fascist, by people who barely understand the term. It turns public discourse into a shouting match instead of a debate.
I personally believe that being a communist or a Nazi should be a bar to public office in the United States, but I can also explain whyt, using objective criteria, totalitarian philosophies undermine and subvert the legal framework which our Constitutional order requires in order to exist. Ridicule is a tool, but it must serve rational argument, not replace it.