Yes, I knew all along that "toxic" means "dangerous". When we're not talking about eg. plutonium, we at least borrow the seriousness of that use. It's a very strong word.
> [...] his actions are to call people stupid over their religious beliefs.
I think it's a stretch to call speaking an action. Hitting religious people would be an action, calling them out really isn't.
Stallman is apparently not the most agreeable person, and possibly he's been nasty and hostile. Some people have chosen not to work with him, others have worked a lot with him. He's not killed anybody, he's not made of plutonium, there's no danger.