This seems pertinent to KS discovering that "Be kind" etc etc is not in fact harmless:
www.lewissociety.org/innerring/
If you are drawn in, next week it will be something a little further from the rules, and next year something further still, but all in the jolliest, friendliest spirit. It may end in a crash, a scandal, and penal servitude; it may end in millions, a peerage and giving the prizes at your old school. But you will be a scoundrel.
And to reiterate the genuine harm caused by insisting on this nonsensical luxury belief, an academic account of a trans man experiencing a stillbirth because no one thought "he" could be pregnant:
https://www.nejm.org/doi/full/10.1056/NEJMp1811491
Sam, a 32-year-old man, was brought to the emergency department by his boyfriend. Sam reported an 8-hour history of severe (8 out of 10), intermittent lower abdominal pain. In triage, he had a blood pressure of 185/84 mm Hg and a heart rate of 67 beats per minute. The triage nurse noted that he was an obese man who appeared comfortable between bouts of pain. Sam told the nurse that he was a transgender man. His electronic medical record (EMR) indicated that he was male. He had previously used testosterone, as well as antihypertensives, both of which he had discontinued because he’d lost his insurance coverage. It had been several years since he last menstruated. He had taken a home pregnancy test that morning and got a positive result, but he wondered whether it was a false positive. He added that he had “peed himself” that morning.
The triage nurse assessed him to be a man with abdominal pain who had not taken his prescribed blood-pressure medications. Determining that his condition was stable, she triaged him to nonurgent assessment. Laboratory samples were drawn, including one for human chorionic gonadotropin (hCG) testing, and Sam awaited further evaluation.
Several hours later, an emergency physician came to evaluate him. She noted the positive results of the serum hCG test and took a more detailed history, considering possible early pregnancy complications. On examination, she noted that his abdomen was not only obese but also gravid. The evaluation had changed: the patient had severe abdominal pain, possible ruptured membranes, and hypertension in advanced pregnancy, which suggested possible labor, placental abruption, or preeclampsia — urgent conditions presenting a potential emergency.
Bedside ultrasonography was performed, confirming an advanced pregnancy with unclear presence of fetal cardiac activity. The obstetrics team was paged urgently. On pelvic exam, the cervix was found to be dilated to 4 to 5 cm. The umbilical cord was palpated in the vagina: Sam had cord prolapse of uncertain duration. The fetal head was immediately elevated. Sam was rapidly counseled regarding the findings and the need for an emergency caesarean delivery. He consented and was transferred to the operating room for further evaluation. In the operating room, no fetal heartbeat could be detected on ultrasound. Given the fetal death, Sam was transferred to a delivery suite where, moments later, he delivered a stillborn baby.
After discharge from the hospital, Sam reestablished care. He resumed antihypertensive treatment and requested the placement of a copper IUD. Though he had not planned or expected the pregnancy, he was heartbroken at the loss of his baby and had a major depressive episode. Despite having significant dysphoria related to menstruation, he has not resumed testosterone treatment, since he prefers to have continued menses that reassure him that he is not pregnant.
I know I put this on the previous thread, but I think it bears repeating. Refusing to acknowledge biological sex causes real harm to real people and doctors above anyone should understand this.