What an awful mischaracterisation. While the dislike feature may appeal to misanthropes, it also appeals to the much larger pool of people that are intelligent enough/respectful of their own time to understand the value of the feature in helping to avoid poor quality and misleading content.
It really bears out in the results. For those who recall what old ratios looked like, for sufficiently popular videos, they still hold true with this plugin.
How so? Like/dislike ratios are a very quick and effective means of identifying problematic content. Clickbait titles and thumbnails are another issue - they aren't a reasonable indicator of the quality of the content. It's an emerging trend in an oversaturated environment in which even creators of high quality content feel the need to partake.