I think this is what I need to say to you next Thursday:

I think you overreacted last session, and I think you seriously overstepped. I don't think we can continue to work together if we can't agree on that. This is really hard for me because I grew up with people who never admitted their mistakes and doubled down when confronted with them. I didn't come here today to walk back into the same conversation I walked out of last session. I came to see if we could move forward, and I have suggestions for things I'd like to work on that I think will help me.