Can our book club count an audiobook as finishing the book?

When I mentioned the narrator's voice, our book-club organiser put down her pencil. 'So you didn't actually read it?' she asked. I'd finished the unabridged audiobook on my commute.

Our group chooses novels and meets over dinner. We've never agreed on a required format. I used to bring a paperback, but lately listening has been the way I can finish before the meeting. I still had plenty to say about the character who hid the letter.

The organiser said listening meant someone else's interpretation had done part of the work. She wanted to discuss the prose on the page. That's a fair interest, but she'd announced it after I had already completed this month's choice.

I offered to bring passages in print when we want to discuss particular wording. She said that would still be borrowing the discussion from people who read properly. Should I ask the club to agree on what we're there to discuss, or accept that this group wants a kind of participation I can no longer reliably offer?