Ooh crikey. Some misunderstandings while I've been gone. Okay, I'll try and address the main questions - I only skimmed the thread so please do say if I've missed something.
Firstly I am incredibly sorry that my comment was misinterpreted to suggest I thought homosexuality was "silly". Of course I don't think that and I am gutted that my poor wording came across that way. I apologise unreservedly. The thing is, everyone in my life - including the gay people - are trans-inclusive and their attraction (or not) to someone is not based on their genitals. Which is why it seemed "silly" to me that someone would rule out a romantic relationship based purely on someone's genitals. Clearly I was wrong and there are lots of people who would do that. That's a misunderstanding on my part and I'm really sorry. I may not understand it but I do respect it. I will never ever support any suggestion that anyone should have a sexual relationship with another person no matter what their reason is for declining and I would be happy to disagree with TRAs on that matter if required (if I'm honest, it's not something that's ever come up amongst my trans friends because they all have a healthy respect for boundaries and most are in long term relationships already). I'm genuinely incredibly sorry that I misspoke in this way and I have learnt something from this thread. It won't happen again.
Regarding why I believe transwomen are women - well, I don't believe gender is biological, first of all. On a personal level, I've had lots of issues with my fertility and many of the things people say makes a woman haven't always applied to me. But I still feel like a woman. I trust my trans friends when they explain to me how they feel. I believe the scientific research behind gender dysphoria. Transgenderism has existed throughout history. None of these explanations will be sufficient for anyone who doesn't agree, I know, but there we are.
Regarding Pips Bunce - he doesn't define himself as a woman so nor do I. Karen White is a woman. A criminally mentally ill woman who should never been allowed access to women prisoners but a woman nonetheless. Part of accepting that trans women are women is accepting that they can do awful things just like the rest of us. Particularly when they've grown up being socialised as a man and everything that comes with that. But not all women are the same, and that's true of trans women too.
I'd just like to add that I didn't "flounce" yesterday - I continued to discuss civilly and respectfully (barring the error I apologised for above) and then I had to leave because honestly, being the only person on a thread with a particular viewpoint is extremely tiring and while I continued to engage far longer than usual because the discussion was respectful and interesting, that doesn't mean I didn't find it distressing. I try not to be all "my trans friends" etc because I don't think it's really relevant most of the time but when you're talking about denying rights to people I love and know to be vulnerable, it is hard.
I'm away from my computer today so will find it hard to reply thoroughly. So hopefully I've answered the questions that were asked. I mostly came back to apologise for misspeaking and to thank those who pointed it out.