I might be wrong, but I think I've sometimes seen it here; in any case it definitely happens in many "programmer" online circles (say, programmers.stackexchange: search for questions about the GPL or GNU or open source software): RMS is sometimes disparaged as a loon and an extremist. The Free Software movement as a whole is often disparaged as impractical and out of touch with reality. I cannot say these people self-describe as hackers but... I dunno... they
are asking and answering questions in a stackexchange community about programmers...
I do remember this also happened in Slashdot occasionally. People using free software criticizing RMS as an extremist.
Which is pretty disappointing, given that many of the people doing the disparaging are using software borne out of the efforts of said free software / hacker movements.