Being blunt implies being honest. There was no honesty in refusing to discuss how a trans man does not have and never will have an actual male body.
"You must, however, have seen how this kind of sentiment gets expressed over and over again in open social media spaces and only serves to harm the mental health of those who are exposed to it? Who benefits from it?"
No. What harms trans people is being lied to. What harms trans people is being encouraged to live a lie, to convince ourselves that we are not what we are, and that we are what we can never be. So who benefits from stating the hard facts? Trans people, who can make their decisions with a truly informed mind.
Let's be clear: you, Butterfly, will never be a biological mother, will never have a uterus and ovaries. I will never be a biological father, will never have a penis, testicles or a prostate. Those are facts, and only someone who faces them and deals with them can find mental healtth and peace.
Nobody's dismantling my rights, whether in the UK, or in my country, where I have less rights than in the UK, yet still more than enough to live a good life as a trans person. Whether here or there, there was never a right to use the opposite sex's single-sex facilities, so it can't be taken away.