Don't look at this experience as a waste of your time.... Look at this as another huge eye opening experience and more concrete to your foundation as to why you are leaving the org. I know in my experience, even 4 years later, I sometimes catch myself wondering if they were right on some things, but then I see posts like yours and it reinforces all the lies that were uncovered. Thank you so much for your post, as it really helps those of us that don't return to the hall, by hearing that they are still blind to the real world.
I am just sorry you had to sit through it without saying a word.