This individual that made the complaint sounds like a bully and very toxic to any group/team they are a part of (no matter how genuine or well-meaning they sound or feel personally). Personally, I would find it very uncomfortable to work with them and I would not feel safe around them. Likewise I would worry about my coworkers being around them at the same time, especially those that aren't well-suited to deal with individuals such as this.

I mean look at how far this thing has escalated. Does that seem like healthy group behavior to you?