I'm fine with "Trekkie." I'm also inclined to think that a "Trekker' is just a Trekkie who is putting on airs. And insisting that "No, I'm a Trekker, not a Trekkie" is just going to make most people roll their eyes . . . which is probably the opposite of what you're going for.
I'm a Trekkie and proud of it.
And I'm a Trekker and proud of it. Let's not pretend that both words don't exist. Both do. Therefore both have meaning, even if informally.
You realize that, given this repeated (in some form) opinion from some of those who choose to call themselves Trekkies, someone who calls himself a Trekker might conclude that the exact reverse is true---that it's the Trekkies who are putting on airs. I'm not rolling my eyes at your statement, and it's eye-rolling that's a feature of judgment.
This Trekker lives and lets live. I didn't snigger at Trekkies, mock Trekkies, roll my eyes at Trekkies, or impute a hidden, insecurity-spawned meaning to that choice of word. I just stated what I consider the difference and placed myself in one category.