As cathartic as it is to leave nasty comments on videos like these, all it does is validate their position in their minds and expose the account you use to post to harassment. The way youtubes algorithm works is any interaction boosts the visibility of a video, so even downvotes help increase the reach of a bad video. The best way to counter this sort of thing is make content of your own, but that has its own drawbacks.
Honestly the ZTT podcast crew have more guts than I do when it comes to countering the narrative and that's the kind of content we need as zoos.