Don't argue back, agree with every crazy thing she says even if it's completely wrong. Of course don't agree to financial matters or custody, but with those things say you'll think about them or discuss it with your attorney. Avoid any marriage or relationship talk. Avoid anything to do with the past... and if she brings it up blaming you or saying how bad it all was.... just agree and say you are sorry it happened this way, or that she feels that way... even if it's not your fault!!!
She initiates arguements to make this divorce easier for her. Don't let her have the satisfaction.
With regards to your behavior and responses.... think Ghandi, think Mother Thesera.... always take the "high road."
There is no arriving, ever. It is all a continual becoming.