Would a popup in the game help decrease toxcisity rates?
Like, imagine player x, frustrated over the game, starts typing the classical insults etc.
But wait, the message doesn't send as he hits enter. Instead a client-side scan of the entered text is done and if it finds that it contained something alongside "You're a c%%t/F%g/insert other flames here, it'd do a small popup with text saying "are you __SURE__ you want to send that?" and offer the option to send it with one more enter click or delete it with one backspace click.
I honestly think it might be slightly therapeutic for people to just write up their toughts and just burn them with one click of the button while not impairing communications whatsoever.