Usually when you come across individuals like these it can be quite bothersome. To be honest with you, there is no "Blue Print" out there as to how you should deal with situation like these.What I personally think might be effective however, is not to try to go "toe-to-toe" with these exes. You see, it is simple as this - it takes two to start an argument, but takes only one to crash it! (As long as that person does not get up in your face), let he/she keeps talking; sooner or later it will register that it's over and it's time to move on. Thou I must admit that some of these exes keep bickering back and forth for long time, before finally giving up, especially when they have personality issues!