What is it about mumsnet and this issue? Why do you care? Does it affect you? Just leave people alone.
We care because it is affecting women and this is a predominantly female forum.
This mangling of language leads to companies competing with each other to come up with the most degrading terms they can to refer to women. I don't care if you're happy to be referred to as a bleeder, a menstruator or a cervix haver. Most of us are not, it's not how you speak about human beings.
We're now living in a world where women are not allowed to be referred to as women, but are forced to call males women.
The ideology has led to known rapists being locked up in women's prisons, where to the surprise of no one with half a functioning braincell, they raped the female inmates. There's a court case (Judicial Review) to try and stop this ever happening again starting tomorrow.
It leads to sportswomen being cheated out of awards that they've trained all their lives for.
It leads to women who publicly state they believe in biological sex being sacked, sent death and rape threats, and having their home address posted online.
Women talking about their rape, domestic violence, the deaths of their babies and children are being accused of weaponizing their trauma.
Two women campaigners, FGM survivors, were absolutely hounded and racially abused because they used the term FGM. This is apparently transphobic because men and boys can have vaginas and so FGM isn't exclusive to females 
It has led to lesbians being sexually harassed by males claiming to be lesbians. Lesbians are being told they should get therapy to get over their penis aversion. So the ideology is hot on homophobia and conversion therapy.
And just a few days ago, it led to the stillbirth charity SANDS excluding the word 'mother' in the name of 'inclusivity'. When bereaved mothers pointed out they want to be referred to as mothers, they were called transphobes, bullies, and accused of 'centring themselves'.
Instead of asking us why we care, try asking yourself why you don't.