I happen to believe that for many people over the age of, say, 35, their approach to the transgender debate is coloured to a certain degree (whether consciously or unconsciously) by this sort of thinking: "It wasn't a "thing" when I was growing up". "I never knew anyone at school/uni/work/etc who was transgender", and so on.
Some context for this. Now to be clear this isn't meant as a direct (or any sort of) rebuttal, but I do think it does provide a valid perspective.
It's not so much that the broad social concept that we're now discussing as transgenderism didn't exist, it's that it was being approached from a different angel.
Again up until what we now generally think of as transgenderism came into the discussion the big push was toward desegregation of the sexes, taking things that one sex could do but not the other and getting rid of that restriction.
Homosexuality, cross dressing, wage equality, women's liberation... all sort of broke down upon those lines. Men wanted to be able to have sex with men, women wanted to be able to have sex with women, people wanted to wear clothing not traditionally associated with their sex, women wanted to be paid the same wage for the same work as a man, women didn't want to seen as defaulting to staying at home, raising the kids, etc.
That was always the path I thought we were on; making the sexes more equal. Looking at things that one sex could do and the other couldn't and going "Okay let's look at this really hard and see if it's necessary." And I thought, and still do, think that's a noble goal.
That was the battle. And my main issue with transgenderism has always been how it never admits that it is running, not contrary but certainly in a weird parallel path. When you're fighting to make the teams equal and then someone runs up, really, really concerned that they are the ones getting to choose which team they are one... we all get that's weird right?
Again we're on like the 25th loop of this same discussion so I'm pretty sure of the answer I'm going to get; that gender identity is not incompatible with sexual equality and I'm not necessarily disagreeing, but gender identity is, by definition this point can't be counter-argued, going to become less important the more equal the sexes are so I don't think I'm being paranoid or hateful by raising an eyebrow at a subtle culture that is become really, really, really emotionally invested and putting so much of their indenity in defining their own genders.
Like I'm sorry but the idea that Bou-"I'm a woman from every single possible angle because I say so"-dicca or someone like her just isn't going to be happy in a world where men and women are as equal as possible, therefore that extremely important to them and defining part of her personal identity means little to nothing, isn't crazy.