Any good gained with this will be overshadowed by losing super important feedback from real users about negativity of the content. Kids videos, tutorials, whatever. How will you know you are getting the best result for your search instead of some search-optimized garbage that already lured tons of people before?
I suppose seeing highly disliked videos is a good red flag for some, but these videos don't really show up in search results or recommendations to begin with. I can't remember the last time I've seen a video with any more than 15 or 20% dislikes. Either way, you should probably watch the video anyway and make up your own mind.
