I've been here for ages (albeit under a different name), I've worked with and known a couple of transwomen (both transexual), who were perfectly nice people in their own way, but I shared an office toilet with one of the two, and it made me uncomfortable. The way that people who had known the transwoman pre-change also made me uncomfortable though, and I work in IT, so generally with men, and I'm used to them making me feel a bit uncomfortable on occasion, so shrugged it off. But (I'll call the transwoman K) but K wasn't good at her job, she was rather a CF in fact. She was also a kawaii anime girl, despite pushing 40. Still I sympathized, but wanted to keep a distance, just like with all the other people I work with, but she kept making me uncomfortable with some 'forced friending' style stuff - 'girls together'..
Then later I came to mumsnet, and the GRA plans were raised, and I thought back to her, and how she acted, and how I felt about that, and saw that other women felt as I did, and how she acted seemed to tally with how so many other transwomen acted, and as fine as she was, the idea that she was legally materially the same as me, even though she definitely wasn't, nagged at me, and I could see wasn't right. She didn't need the same protections as me, she wanted to be sexually harrassed (validated - where she wasn't), whereas I had to hide in bars from people so I was left alone. She wanted to have colleagues do her work for her because she was feminine and weak, whereas I (and my 2 or 3 female colleagues) wanted to just get on with our work.
It boils down to the fact that I didn't like to hear people say nasty things about her, and defended her when she wasn't there, but she also wasn't subject to the same pressures as me, and was materially different, and I I needed to have that respected too.