Why are Pretribulationists so averse to dialogue? A simple question. A fair question.
I think they repel from meaningful interaction, to be frank, because many of them wish they had never seen the Prewrath position. They saw something that conflicts with what they have set out to believe. So they ignore it, hoping that it will go away.
And since it does not go away, they will ridicule or misrepresent it.
Pretexts aside, fear of being challenged is what drives them back into their sanctuary of Tradition.