In previous HN discussions, it's become apparent that some people use it to say "I am not interested in this video".
That is of zero use to other users. The video isn't necessarily bad, it's just on a topic you don't care about.
If you are instead using it to mean "this video is factually wrong" or "this video is obnoxious" that might be useful.
If you are using it to say "I don't agree with this political viewpoint" or "I don't like this movie/superhero/game/TV franchise", then that's also probably not that helpful.