I think the problem that's created the "peak trans" mentality is this.
I absolutely support LGBT rights. I support the right of people not to be mocked, vilified or otherwise discriminated against because their sexuality or gender identity makes them "different". I think it would be totally wrong if a person who transitioned from one gender to the other was dismissed from their job because of it, like gay people used to be, or women used to be when they married.
I support gender reassignment surgery being funded by the NHS, because it alleviates a huge amount of mental distress and as I understand it the outcomes for people's quality of life post-surgery are overall very good.
One of the really important things equal marriage achieved is that if a person transitioned to the other gender and was in a marriage already, they wouldn't have to divorce and then become civil partners, if their spouse chose to continue the marriage.
This stuff is really important - it's about supporting people's rights to live a free and happy life, free from bigotry and discrimination.
However, supporting all those things doesn't mean accepting that a person's self-identified gender automatically defines the biological sex they are and always have been. It just doesn't. Overall, I have no problem with trans people having access to the women's fitting room in Topshop, or women's toilets, or even in some cases women's schools and universities, especially if they've fully transitioned (ie have no penis).
There are a few areas where I do have a massive problem. Women's prisons is one. Given Tara's choice of career, she must be pretty capable of handling herself in situations with potentially violent men. But she has displayed violence to women, and she has a functioning penis. Therefore, as far as I'm concerned, she should be in a male prison with all the protection and support she needs - as any other vulnerable person with a penis should be.
I've also got a problem with transwomen competing in women's sport. Their physicality, even after transitioning, is different. They will have benefited from the socialisation and the training in sport that boys receive to far greater advantage than girls. It's not, as far as I can tell, a level playing field.
I also have a problem with trans equality and women's equality being conflated. Let's say tomorrow David Cameron and George Osborne both came out as trans. Should we suddenly be celebrating the fact that we have a woman PM and Chancellor? Obviously that's absurd, but when we have the achievements of transwomen like Caitlyn Jenner, Kelly Maloney and Martine Rothblatt being celebrated as women's achievements, that actively disadvantages women by skewing the inequality that currently exists for women.