Mumsnet educated me on this topic. It was around the time of the Women's Equality Party becoming established (which I initially thought was a great thing) and I was feeling increasingly frustrated at finding the MN feminism section full of threads about the 'trans' issue, as I couldn't understand why it was taking up so much airtime. Having recently had my DC I was more bothered about things like maternity rights, equality in the workplace and sexual assault.
I can't remember who, but it was a MNer saying that once any man can declare himself to be a woman on self-ID alone, not needing to go through any medical process, then any female space was open to him and therefore access to vulnerable women and children. At that point, something clicked in my mind and I realised that, with the self ID bill looming, this was an emergency.
The second point that got through to me was around transitioning young people. I had taught in diverse areas of London throughout the noughties and this issue had never, ever come up, so the idea that there was a sudden epidemic of young people with gender dysphoria being treated with irreversible processes was horrifying.
I was also old enough to remember the surge of people suffering from multiple personality disorder in the 1990s - plus other peaks in psychological disorders during the noughties and 2010s - so wondered if this was something similar.
From that point on I have been working behind the scenes to stand up for women. I am not brave enough and my situation isn't secure enough to be completely 'out', but I have completed consultations, donated, written emails, spoken to my local councillor, complained to the county council about a display in my library, written supportive emails to key GC women, nominated GC women on International Women's Day and a few other things I have probably forgotten. Plus quite a bit of passive resistance to language changes in the workplace.
What had I thought before that peaking moment? I hadn't heard the term 'transgender', I knew that there were transsexual people who suffered from psychological difficulties around their sexual identity, but I assumed that they all went through a surgical process before 'becoming' the opposite sex. I thought it affected a miniscule proportion of the population who were so much the exception that they might need special arrangements for compassionate reasons.
Did I ever imagine that a man just dressing as a woman would be expected to be seen as a woman and allowed to get changed with women in a changing room or competing in a women's sporting event? Or that women could be censured for objecting to this situation? Or that the language used to describe entirely female experiences like periods, pregnancy, birth or breastfeeding could be changed? Not for one second.