The point is really, who cares? What's the point of having to pass some qualifying test to use the term "trekkie"? Why does it bother anyone to have someone use that term when they have spent less time in the fandom than others? It's not like they are saying, "oh, I'm a pilot" and you need to see credentials before you get in the plane.
Plenty of people call themselves trekkies who are pretty much one series people. A whole generation is TNG besotted and kind of meh on everything else. People call themselves trekkies and have not seen entire series of Trek. Now I'm a Trek-Omnivore, I have seen and enjoyed all Trek and own most Trek. Often I meet people IRL who identify as Trekkies and want to talk about how wonderful it is.. and for them it begins and ends with TNG. They have not watched DS9 or VOY and maybe not even heard of ENT. I don't care. They can call themselves trekkies if they like and I can talk TNG with them. I'm not there to GRADE them on their trekness ffs.