Sometimes people need to be educated slowly. I think the first thing to do is to be very clear about how the therapist's attitude is affecting the therapy. "You seem to have some preconceived ideas about this. It's hard for me to tell you about my experience because I feel that you are filtering it through your own negative feelings about this."

I think you also need to be clear about what works for you in the relationship. In what way does this relationship differ from the abusive one you had in the past? Is the relationship therapeutic for you in any way?

You might try sending the therapist to this site or some others to see how people manage some of these relationships.