josepp, all I can tell you is that on all the videos I post on my YouTube Channel (WildeNotesMusic) - whether they are my own or videos of other people -- I use my settings to "Allow comments with approval" only.    That allows me to ignore the really rude, juvenile, unhelpful comments.    I don't censor them based on whether they like the video or not, but on whether the comment is clear, understandable, and basically civil.
So if someone wants to say, "Your singing is very pitchy," or "I hate your voice and your guitar work is very amateurish," I'll allow that. But if they want to post something like "You suck, bitch!" or "Boy, you look fat!" or the like, I won't "approve" the comment.

Millions of people view YouTubes and among them there are going to be those who are immature, mentally unstable, drunk, high on drugs, pissed off about other things & needing a scapegoat, or some combination thereof.   Don't let those folks spoil the good things about YouTube.    Some people "deserve a good lettin' alone" and that's the best way to deal with them.

Genie