I have a question: Why should I care about showing consideration for someone who feels no need to show consideration for me?
I've worked with three transgenders (men who wanted to be women). This was back before this whole furor erupted. Two of them wore dresses and makeup to work. One of them had already legally changed his name to a female name prior to getting hired by my company; the other went through the process to legally change his name after he was already employed. The third had gone through the entire surgery regimen, top and bottom both.
I never had a problem addressing them and referring to them by their new names; your legal name is your legal name, however strange I might personally think it is. For the two who still had all the male parts, I never accommodated their "preferred pronouns", but I never made a big deal out of it, because THEY never made a big deal out of it. They didn't throw tantrums and demand that everyone actively acknowledge them as women, and I'm good enough with English usage to simply avoid third-person pronoun usage without making it apparent and thereby getting up their noses about it. They both found ways to avoid using the restroom with other men without imposing on the women. In this way, the employers made it easier for all of us by having a separate, one-person-at-a-time bathroom available. (I don't think it was specifically for these occasions with either of them. I think both times it was due to architectural quirks when the buildings were remodeled. Still, it helped a lot.) All they wanted was to be left alone to live their lives as they chose in peace, and they were considerate enough not to make other people's lives uncomfortable, so we were considerate of them.
The third one, who had undergone all the surgeries, was a whole 'nother kettle of fish. He had completed the surgeries years before coming to work at this company, and also changed his name legally years before, so none of us had ever known him as a man, or had any reason to think about it at all. He is part of the reason I say that transgenders are not people who identify as the opposite sex; they are people who identify as people who identify as the opposite sex. In other words, they identify as transgender. Transgender itself is their gender identity.
This guy could have simply gone forward presenting as a woman. None of his co-workers had any reason to question it, or even think about questioning it. He was an ugly woman, but there's no shortage of those in the world, so . . . But he could not just leave it alone. For completely inexplicable reasons, he just HAD to "come out" about it. It was our third week of training (he and I had been hired at the same time), and the class was playing a "breaking the ice" game called Two Truths and a Lie, where each person anonymously writes down two truths and a lie about themselves, and the rest of the class had to guess which person in class it was about, and which statement was the lie. The whole class is laughing and joking and having a good time . . . until the instructor read out the statement, "I was originally born as the opposite sex." Complete, dead silence. All of a sudden, everyone staring at the floor, because not only could we not possibly make any guesses as to who the person was without potentially insulting someone, but even looking at another person might imply you thought THEY were the person and insult them. We all just sat there awkwardly and uncomfortably for several minutes, until he spoke up and claimed his card and told us ALL about it and how he was "completely female" now, rather defiantly. (This dimwit also thought he had somehow become a woman genetically.)
Let's just say I made no effort to be considerate and accommodating of this fool at all, and had no problem getting right up his nose if I felt it necessary. Seems only fair, since he'd felt the need to get up mine.