People objecting to the idea that someone might have pressed the dislike button for whatever reason, unable to handle the mild cognitive dissonance of divergent opinions always stood in stark contrast to the old mantra that graced the signatures of slashdot and other forum comments:
"I disapprove of what you say, but I will defend to the death your right to say it."
"I disapprove of what you say, but I will defend to the death your right to say it."