If they persist, simply ask if there might be another time to meet with them when it might be more convenient. You may need to eat your fair share of “crow.” But to subject yourself to unbridled abuse is not necessary or proper. It is good to be willing to bend over backwards and go more than half-way as part of the process, but don’t sell your soul, either.
One of the classic signs of reactive legalism is a reactive, impulsive appeal to Matthew 18. When this directive for church discipline is followed in a hasty, “surgically clear” literal “One-Two-Three” you’re out fashion, it’s not being used properly.
Peter’s question, “How many times should I forgive my neighbor, up to seven times?” was intended to make this paradigm of church discipline a loveless, legalistic process. “If I just do this, then that, then that,” Peter may have thought, “Then I can excommunicate, right?” Jesus’ infamous response was disappointing to Peter and anyone else seeking quick-fix church discipline.
Whether the precise translation is “77 times” or “seventy times seven times,” the meaning is the same. Reconciliation and church discipline take time, patience, and sacrificial love. As hard as it can be, give the Gospel a chance to predominate and forgiveness to reign.