If you use language like "they are themselves incapable of producing the tiniest bit of contrarian thought", "they are too scared to break rank with what is socially acceptable", etc. then of course you are judging others, whether you say you are or not. What I don't like about comments like that one (nothing personal mind you) is that they don't actually say anything. It's all just pejorative language, putting down others, and thus implicitly taking a superior position yourself.
Unless I'm missing something, the only sentence in the comment that doesn't fit that description is It is very hard to find anything subversive outside of anonymous clubs living on the fringe of the internet, a few domain specific publications, and "crank" hot-spots. That, at least, isn't putting down other people. But why assume that the people you're talking about don't know this?