These sentences introduce some topics that are somewhat different from the question of how to relate to transgender people.
1. Consent: Consent is normally discussed in the context of sexual activity, not gender identity. Having your partner's consent is a necessary (though not sufficient) condition for having sex with them in a way that is morally acceptable. I assume the reference to consent here is just an accidental oops, but I wanted to clarify.
Agreed -- I like the way Christine Emba put it in her book: "Rethinking Sex: A Provocation." "Consent should be the floor, not the ceiling."
2. Gender binary: This is more interesting, and I'd be interested in exploring it with you, if you'd like to discuss it. As a preliminary comment, I'll note that it's quite possible to talk about transgender people completely in terms of a gender binary -- namely, to say that everyone has a personality that's either masculine or feminine, and most of the time that aligns with their male or female body, but sometime's it's misaligned. This way of describing it still speaks in the language of a gender binary.
Here I have to disagree somewhat, because you seem to be thinking of "personality" as a single monolithic
thing, and not a collection of attitudes and behaviors... each of which are perceived as "masculine" or "feminine" by society.
By contrast, people who talk about "rejecting the gender binary" are talking about the idea that people's personalities, interests, and aptitudes can range from the stereotypically masculine to the stereotypically feminine, with lots of gradations in between and lots of mixing-and-matching (e.g., a person can like to knit and also like to fix cars).
Here we go... this is more in line with what I'm talking about -- certain behaviors and activities are, as you say, stereotypical of "masculine" and "feminine." But of course, those stereotypes can change as society changes.
The idea is that, while there may be some level of statistical correlation between psychological femininity and biological femaleness (or between masculinity and maleness), a person's body isn't anything like a perfect 100% predictor of their personality, and that it's good to acknowledge and celebrate people's wide varieties of personalities, interests, and aptitudes, instead of making them conform to one of two boxes, "masculine" or "feminine".
Agreed -- but while you talk about the biological and the psychological, I think you're leaving out another crucial influence: sociological. Our society is constantly bombarding us with messages (one could even call it "propaganda") regarding what it means to be "masculine" or "feminine" -- how else did those stereotypes come to be in the first place?
Our parents, our peers, our schools, our religions, our celebrities -- every book, movie, TV show, song, fairy tale, etc... reinforce those stereotypes.
"Boys don't cry,"
"Man up!"
"Good girls don't ______,"
"Daddy's little princess..."
Our bodies and brains are influenced by our personal experiences, social sphere, and wider culture... and in turn, go on to influence them.
You say you want to be "affirming the gender binary", so I assume you disagree with at least some of what's in the preceding paragraph. What do you mean when you say that you want to affirm the gender binary?
I'm curious about that myself.