In fully anonymous platforms like 4chan it also just takes one participan to step away to end a dispute unlike non-anonymous or pseudonomynous platforms where there are more avenues for continued harassment.

But really to have this discussion we first need a better definition of what we are talking about than nebolous "toxic behavior". I don't think anyone is going to dispute that 4chan posts are more likely to use crass language than those on Facebook so perhaps that is what gp considers toxic.