It's at the point where the situation will continue to worsen until someone is in the hospital or jail. Josh has proven that he cannot successfully handle this situation and that his father must step in.
I believe that Clint will allow this situation to continue until the police are at his door informing him that his son is dead. At that point he will go to the newspaper and inform them that vicious cyber bullies from Kiwi Farms murdered his son. Eventually, once he's done stroking his own ego, he will bury Josh.