I don't subscribe to the belief that gender is different from sex. Honestly, if that's our biggest area of disagreement, I must be doing something wrong. I have much, much more objectionable views than that.
Of course it's (probably) not our biggest area of disagreement (For God's sake, you're a libertarian!). It's just the one that rubs off on me the most, albeit for admittedly selfish reasons.
Regardless, I hope you understand that this does not equate to a denial of your humanity. I like your posts on this site; you might be a bit more focused on social issues than I am, but you take dissenting opinions in stride and have a good sense of humor. I've said before (and I will say again) that I would refer to you by whatever pronouns you want if we met in person, for the same reason that I might say grace with Fuzzy Bear if I were to have dinner over at his house. Perhaps I don't personally share your beliefs, but I would still extend the courtesy for an individual who I genuinely respect.