I know that I am being watched by people with vastly different opinions on this matter so I need to be careful what I say. In response to the main issue being discussed on this thread.
Firstly, I regret sharing in a private group a flippant report of a flippant comment I once made. I apologised to the group shortly afterwards and I apologise here. While I do sometimes use black humour to get through what life throws at me, in this case it was totally inappropriate.
Secondly, I respect the wishes of whoever is chairing a meeting I attend. I have joked about using buckets in the past. That was also flippant. Always arrangements have been made for trans people such as me that respect everyone's dignity. Indeed at Bloomsbury Baptist Church it was single use facilities for everyone as far as I could see.
In wider contexts I can make arguments for:
(a) Strict sex segregation;
(b) Segregation on the basis of apparent sex characteristics - i.e , GRS and hormone treatment;
(c) Segregation according to "the gender in which you are presenting".
The latter is the is the easiest to police in reality - and it's how things have worked for years. Transsexuals were quietly accommodated without anyone checking our GRS status.
However, things have changed. It isn't just Self-ID, a seeming sense of entitlement has damaged the trust and confidence that used to keep us all going. I saw this coming three years ago, and it led to my first blog on this topic: debbiehayton.wordpress.com/2016/11/29/caution-urged-when-parliament-debates-changes-to-trans-rights/
I recognise the strong feelings here. I also have strong feelings because this is personal to me. I am struggling with this at thee moment so I'm not going to indicate my current practice. However, I will say that one argument that really troubles me is:
By using the women's toilets, I make it more difficult for women to challenge those with nefarious intent ... the abusive male could say "well if it's OK for Debbie then why not me?"
That puts women in a very difficult position. I get that.