Try the book "verbal judo" as the counter to 'verbal karate'... I have found it very very helpful for me having a spouses who think they get to be debate partners.
It's by George Thompson, & he gives a lot of examples from his line of work: as a police officer.
The principles and tactics taught enable the reader to use "Presence and Words" to calm difficult people who may be under severe emotional or other influences, redirect the behavior of hostile people, defuse potentially dangerous situations, perform professionally under all conditions and achieve the desired outcome in the encounter.
Divorced 03/2010 Mom to two amazing kids
Taking the road less traveled because those encountered on the way may be just as unique.