In my not-so-long time here, I've seen only about three members struggle with serious mental health issues, but they aren't actually toxic. When it comes to toxicity, you can always count on certain members to bring that energy to every discussion. Maybe they lack self-awareness, or maybe it's just performative. Either way, it's a waste of time to think about.
But I don't think this is unique to this One Piece space or the internet in general. Everywhere has become more toxic since the lockdowns. I actually find Worstgen a cozy spot for discussion, since I've been in much worse communities. Just don't engage with what you find unhinged.