A recall a scene where a woman led an encounter session by belittling a large man in front of the group. She abused him verbally and then made him disrobe. The movie did show the entire weekend to be useless. The woman was a rather famous actress. I saw this movie about twenty years ago and I can’t remember much more than this scene.
Sounds like Brainwash, also known as Circle Of Power
http://www.imdb.com/title/tt0085340