^^ You're right that the term "real fan" is overstating things. What is a "real fan?" To be a real fan do you have to like Trek in all its incarnations? If so then that leaves a lot of people out. I know of several people who like only certain series or films and still liked Abrams' film.
And candidly I don't know anyone that likes Trek in all its incarnations.
And candidly I don't know anyone that likes Trek in all its incarnations.