There is always a function called "ignore" or "block" in the chat systems.
by the time you ignore & block the toxic guy, the damage already done..better don't have it at all.
you can friend the person on fb & chat with them, well if they want to befriend to u tho..
i can do that, but some managers use special characters names, and anonymous name. so its hard almost to find their FB , also some managers protect and making their FB private