I can't understand how someone NB feels, Doodle, as I don't feel that people fit into stereotypes. I am a woman, but I sometimes wear trousers, and sometimes drink pints or cut my hair (it's long just now). I keep asking what being a woman is, but even those who claim that it's possible to 'become' one can't tell me, so I'm left with those external markers, as I already have the hormones and body of a woman. To me, someone saying that they are non-binary is suggesting that other people are (by definition) binary, and that conjures up pictures of women in circular skirts and red lipstick, beaming as they stir cake mix before cleaning the sink and polishing the children before their husband gets home from his manly job.
I don't know many people as binary as that, so I don't see the need for anyone to make a fuss about having a NB 'gender' - most of us do, whether our sex is male or female.