Er no, Mumsnet is in fact well-populated by people who do not have children - a place of female homosociality is a rarity on the internet (the number of male posters is so small it effectively doesn’t alter the nature of the space). There are lots of women who post here because MN allowed discussion nowhere else would; branding it transphobic to discuss things like the harm caused by allowing male people to be imprisoned in women’s prisons.
Public posts on the internet invite public commentary. Posters being broadly unsympathetic on here is neither harrassment nor is it bullying. Brigading the TikTok page would be inappropriate; discussing information this individual has publicly disseminated in this thread is not.
As a point of information, individuals with autism &/or ADHD are neurodivergent, not neurodiverse. Humanity is neurodiverse - everyone has a unique way of processing information.
As other posters have said, yes, lots of us know people who identify as transgender. Knowing, liking, even loving said individuals does not mean uncritical acceptance of the entire group; just as is the same of any other group of people. I have lots of Muslim friends - didn’t make me (nor them!) on board with ISIL &/or uncritical of those involved in the murder of Samuel Paty. I’ve Protestant family members but abhor the Orange Order. Equally, I’m often fiercely critical of socio-cultural groups to which I belong myself.
You may be unbothered by the presence of male individuals in female spaces, but you cannot consent for other women. And no, it is nothing like segregation in the US/apartheid in South Africa for women not to want male people, however they may identify, in female spaces. Cubicles are indeed individual - but there are common spaces within public toilets where women have every right to still say “no” to the presence of male persons. Moreover, given the number of transwomen who post about listening to women urinating as a fetishistic behaviour & indeed masturbating in the women’s loos as a way of “claiming” the space it is absolutely everyone’s business that people are breaking the social contract thus. Clearly not all transwomen engage in behaviours like that; but the VERY basic principles behind sex-segregated facilities mean that male people cannot reasonably be included in female spaces. It is not because these males identify as women; it is because they are male. We do not allow disabled men or gay men into female spaces; even male children are not permitted in them from a fairly young age. Where there are actual rules in place - eg in changing facilities - rather than simply following the social contract, boys are usually expected to use the male facilities from around age 8. Allowing adult males into those same spaces male children are barred from because they “identify as” women is a logically incoherent nonsense - & women are perfectly entitled to point that out.