I’m not either because Star Trek aspires to being merely tolerable in book… Star Wars is where it’s at.
But as far as I’m concerned, Trekker implies a person who Treks, and nobody who merely watches a TV show is doing any Trekking. Trekker is a title for chubby guys who live in their parents basement and mistake watching Star Trek for having a life. They don’t want to be called Trekkie, because they think Trekkie is belittling. And IT IS belittling - you’re a mere fan of a mere TV show, and that’s just fine until you want to elevate it to worshipful Trekker status. If admitting to being a Star Trek fan isn’t at least a little bit self-deprecating, you need to re-evaluate your life.