There might be a bias in this analysis. The programming languages listed in the no-no list are the one people dislike AND know. I can't say if I dislike a language if I don't know it. This is visible with r language.
Yeah, but a lot of people have passing familiarity with perl or have at least been tainted by the sheer number of "I hate perl" sentiments around the web.
The list as presented is obviously biased. When I see that fewer people dislike MATLAB than C#... I don't know what to say to that.
But a lot of us who either can't write Perl or can only write really bad Perl have still read enough Perl to have good reasons to dislike it.
Though I'll concede that with languages like Perl there is probably some degree of hipster-tendencies to actively disliking Perl in that Perl in many circles are seen as a prototypical example of "crufty old language".