It's not just me / the music videos I look up then, is it? I can't help but wonder if it's some kind of YT hive mind, bots, or Google's own algorithms pushing those comments to the top.
And lots of the cesspool was not caused by bots.
This was also around the time they removed the thumbs up/down count.
This was to prevent creator burnout; imagine if every video you put out had some snarky diss against you in the comments.