It has to do with your brain. Obviously you can't comprehend a simple fact because several people have explained it to you, and you still dont get it.
Have you ever thought, with a leap of imagination, that people that don't indentify with the two boxes don't exsist? 'Cuz imma ussume that you're the person that parrots "think out of the box", so think out of these boxes.
Back on topic, so, if people with preferred pronouns don't exsist, should we be locked up in mental hospitals? Of course we should. Nobody wants someone who doesn't stick to the norms, do they?
While your pretty little self has it all figured out, there's thousands who are still going through gender disphoria. For some, this can be the most stressful time of their lives. However, with your clever little thread on the internet, you are putting their views down to mere "coo-coo".
So, before you type out a snarky reply, think about saying in into the face of a black transwoman, who's just about to be murdered. Say it to HER face.
Say it to the face of a non binary teen, who's homeless on the streets, because THEIR parents are enbyphobic, and kicked THEM out.
Do it, I dare ya