Well, of course some of the people in the seats are already fans, and some are not. As a literal distinction, it exists.
But that is not the point JarodRussell was making. What he's saying is that there is no easy way to distinguish between aspects of the film that connect with those two groups (or not). It's not "fans VS the general audience."
I understand that. But the references to old Trek (and sometimes _really_ old Trek) and efforts to maintain continuity with it are probably not directed at the average moviegoer.