On that note, Drizzt, Jay D Legend, Vergo, Nya Hemmingz and Fiji are the Youtubers I was friends with and I used to mod for most of them. They're all pretty cool guys, I like them a lot. Matt Bensei and Red Force Podcast, Christian and Eric are great from what I've seen too.
I think the real issue is not so much the Youtubers themselves I guess, more so the fame they get, the ones who really get big on Youtube,tend to have a much bigger fanbase ofc and thus thats where you get more toxicity as a natural cause too unfortunately, I've noticed that with more popular anime/manga series vs more niche ones and especially with games and their communities.
Smaller game communities tend to be a lot more chill especially if they're only single player or co-op focused but smaller fanbase/lesser known PVP/multiplayer type games can have issues with toxicity and elitism which doesn't help their situation at all ironically.
I suppose the burden of having at least 100k fans or at least some drastically high number like that tends to spur a lot more toxicity in their communites due to the sheer amount of people, a lot of idiots and "meatheads" and such will be there. I kept hearing horror stories of how truly toxic, degenerate, deranged, aggressive etc people were on BDA (Brago/BDA Law's) and KoL's Discord servers were like lol. The other servers I was on were much quieter and I was usually the most active person on them, keeping them alive mostly through my own spamming and shitposting.