The problem with a discussion with Preterists is that they go off into the swamp of cant take the Bible literally. The quick sand of its only metaphor will restrict any real discussion of what the Bible really is telling us.
There are a few who may be amenable to Scriptural truth; those who, along their journey, were told error and given wrong information and who listen to the truth and accept it, and for those I am willing to spend some time giving them what they may have never been told. After all, that is what Jesus wants us to do.
But for the others, I am done. Maybe they'll come to Christ during the Tribulation - I sincerely hope they do. But it's not expected of us nor are we commanded to spend years trying to convince those who want no part of the truth. The time comes to move on.