Usually if I don't necessarily 'like' a video, I don't dislike it.
Though there are a few exceptions, it's usually about things I deem intolerable, such as;
Creepy pedophile videos (about kids doing...things) scattered about the "underground" youtube.
If someone's ignorant and blaring about their uninformed/uneducated opinion like it's an absolute fact and demeaning/ or just not listening to anyone who thinks otherwise.
"Kids" channels/ videos that sexualize their content, even though it is completely unnecessary/ inappropriate.
Videos that claim they don't want to "send hate" to another channel, but are clearly asking for it indirectly.
Fake "caught on tape" videos (ghosts/ monsters/ etc.)
"Having sex" videos (these usually don't get taken down because clothes are on and all you see is either faces/ shadows, or feet, plus the title/description doesn't say anything about sexual activity)
Idk, the list goes on, I've seen a lot of ****** up things on youtube, I'd rather not think about it to be honest.