For me (as a liberal leftie) it was an initial slow progression up the foothills that turned into a swift climb to the peak.
For a while I really didn't see what the problem was. I'd worked with a number of Transwomen and found them to be polite and respectful. I had no problem sharing bathroom facilities or in one case a shared company house with them.
Their gender dysphoria was both very real and very painful. I felt a great deal of compassion.
I now realise I had encountered Transexuals - as they would now identify. They knew they could never become a woman but felt a very strong empathy and respect for women and felt that their mental health would be best served by living (and by investing in intense and invasive medication and surgery) as far as possible a "female" life.
The TS I shared a house with asked prior to the arrangement if I was ok with it. Schedules for the bathroom etc were all agreed. They did their utmost to make me feel secure and comfortable and I respected them for it.
So what happened....
Well I started out defending Trans rights. Politely and certainly not with a TWAW mantra.
Yet guess what? Whilst I had some very thought provoking and polite conversations with GC feminists I was utterly scorned by TRA's.
It became clear how the far the Trans bandwagon had been hijacked - imho not just to the detriment of women but also negatively towards the very transsexuals I'd sought to defend in the first place.
Stonewalls trans umbrella was a nail in the coffin for me. Again imho the amalgamation of cross dressers/"part-time" women/AGP's with people suffering from genuine GD into a single group marked a clear (and I would say deliberate) shift in policy that was harmful to women and the LGB/TS community and could not be intellectually squared as not being homophobic or misogynistic.
After that the hits just kept on coming....
Maria at speakers corner, the intimidating protests at women's meetings, girl guides policy, mermaids, sport, the LibDem LGBT twitter feed, the Challenor scandal, Jenner winning woman of the year, Poise's caution, your caution Gilner, the misogyny of Dr Harrop, India/Munroe's self indulgent rants...I could go on.
It was like opening Pandora's box.
Each revelation, each toxic tweet, every opportunity to shut down debate, every pouty photo showing an overtly sexualised vision of "what a women is" by a man pretending to be one, "revelations" that TW's have periods, denial of ROGD in children, listening to the recording of the Mermaids Barbie speech in schools ...pushed me further up the mountain.
Even now when I feel I must be at the summit a TRA comes out with more testosterone fuelled bollocks and I peak a bit more.
That's my story.
Yours,
DRM
(floating somewhere above Everest)