Rightkindofme, from your story, the first LLL meeting you attended was to get weaning advice. Those women couldn't know your past, or how hard breastfeeding had been for you. It seems unfair for you to be so angry/hurt that they questioned your reasons for wanting to wean. True, I wasn't there, so I have no idea how uncomfortable you felt, and I'm sorry you felt that way.
I still don't see how LLL could possibly be blamed as an organization. And I wonder how many other bad experiences were similar.