If they have a DSD, what does that make them?
I would call the tiny number of people with DSD who are unclassifiable whatever they felt best suited them. But this is irrelevant to this conversation.
If man and woman mean the same as male and female, why do we have two words to describe the same things?
Because people didn't like to say the word 'sex' as they were puritanical and it made people think about shagging.
On your second point, I’m saying that bi people who choose not to date trans people or non binary or whatever else is political, but they would argue that bi relates to two genders, not two sexes. Lots of bisexual people I know won’t date trans people but can’t give me a reason why other than they don’t agree with it. They see bisexuality as being attracted to men and women. If it was solely about whether they were male and female, and obviously trans people are one of these, they’d date them.
No they wouldn't any more than they'd date a Tory. This is convoluted and completely confused. You've totally muddled up who someone CAN be attracted to in terms of their body and who they actually ARE attracted to in terms of their personality
For me, I fancy men and I fancy women. Why wouldn’t I fancy someone who was transitioning, or identified as the opposite gender to their associated sex?
That's up to you of course but they do not transition from one sex to another as they can't change so they are just socially transitioning for whatever that means. They are still either a man or woman - whichever they were born as so you might fancy them as you fancy both men and women.
You’ve said you identify as straight even though you’ve fancied women - for me that doesn’t make sense. It doesn’t matter that you’ve never shagged a woman, if you fancy them, you’re not straight. But you identify as such. So who am I to tell you that you’re not straight? Similarly, if I think queer is the label for me, then it’s the label for me. Sexuality isn’t these nice little defined categories that everyone fits into.
I don't care if people call me bi. I just have never experienced any of the stigma and trauma that people who behave in ways which tell others they are bi have do it seems a bit disrespectful to their experience to call myself that. It's not about defining categories, it's about the effect that it has. So when we make up new categories there are consequences. The Q+ I believe confuses people because it introduces the concept of identify into a system which is based on biology. This disenfranchises those who don't have faith in that particular religion. If LGBTQ+/ straight is about identity then I don't fit anywhere. I only fancy agender people and those agender people pretty much have to have an actual (not mocked up) penis. There is no category for me. I represent the vast majority of people so you have chosen to make a categorisation system which excludes most of the population whilst adding no clarity regarding who you actually might fancy and no clarity regarding whether you are likely to experience stigma and discrimination because of that.