Okay. Just making sure that the question and answers were as clear as possible.
Edit: Okay, now that I'm more awake and have reread your answer, I understand what you were saying. Your ideal answer would have been "not all of them were," but "some of them were" is close enough to work. So if someone said, "Everybody doesn't like chocolate ice cream," you would assume that maybe some people do, just not each and every person?