Well said, and I think people who know me would agree! I don't have a problem articulating my opinions in these kinds of situations, although I don't do it if it's going to cause embarrassment or other problems for other people.
This doesn't happen to me often on the personal level, but I do encounter frustration when some public figure claims to advocate for me. Unfortunately there is realistically not very much that can be done about it. ACME starts sounding like a good option.