None of that is a discussion of either what a Trekkie is or about the new movie. It's something else. The correct answer is that "anyone who calls themself a 'Trekkie' is a Trekkie." It's self-identification, same as those folks who stand up in Alcoholics Anonymous meetings and identify themselves as "I'm ________ and I'm an alcoholic." Their "rule" is that no one can tell you that you are one unless you choose to so identify yourself, and if you do no one can keep you out.