*I'm not anti trans but...' is no different to 'I'm not racist but...'
or 'I'm not sexist but...' or 'I'm not homophobic, but*
Or 'I'm not internalising misogyny but. . .'?
As I'm sure you know, someone starting a statement with 'I'm not X but. . . may very well be about to say something contradictory (or they might not), but when someone is unfairly accused of being X, and they deny it, then go on to say why, in their opinion, what they think is not X, it is a different matter. Should they simply let these accusations pass without comment?
To me, a tranphobe is someone who is afraid of, or used more loosely, who is uncomfortable with someone who has transitioned from one gender to another. This, I can assure you, I am not. I have no idea how I can prove this, but it is unreasonable of you to keep dismissing me and invalidating my assertion without evidence. I could say that I know and respect transpeople, but then I would be accused of using the 'some of my best friends' argument. Against that sort of facile 'logic', it is impossible to win.
What I do feel, and I know that this is where we differ, is that there is a huge difference between sex and gender. This is recognised by the trans community, many of whom find the term 'transexual' to be offensive, seeing it as referring to only those in their community who have medically (using surgery and hormones) gone as far as they can to change their sex, as opposed to only their gender.
This difference is not taken into account by recent moves to allow anyone to declare their gender as being whatever they wish, sometimes different on one day from another. My concerns centre on the fact that men can declare themselves to be women and there can be no argument. As 'women', they can join sports teams, be transferred to women's prisons, join all-female shortlists, count in statistics that measure biological factors in terms of male or female, and can assume positions of power over vulnerable women in rape suites, domestic violence refuges or other sensitive settings. This, combined with the creeping changes in language, threatens to eradicate women as a sex, as we will become subsumed into a 'non-male' category.
This concern is nothing to do with gender, and nothing to do with those who live their lives as someone of a gender different from their birth sex. It is about the ability of men to declare themselves to be women without any attempt to change their sex, which requires medical intervention
Gender is, in my opinion, a social construct which can confine people in normative constraints that are out of kilter with their personality/persuasion/inclination (difficult to find a less loaded term, but you know what I mean). Some people find that they are unable to act within the gender norms that come naturally to them without facing abuse or rejection by those around them, so choose instead to define as a different gender so that they can behave in a way that they find more comfortable. As far as I am concerned, that is up to them, and I have every sympathy with them.
The creeping trend for changing language so that women are slowly being eradicated (womxn, chest feeding, CIS, Natal, AFAB and so on) combined with the way in which men can access women's spaces unchallenged is what concerns me. Both of these things are detrimental to women, which worries me both as a woman and as a feminist, and put together they terrify me as a mother of a daughter.
It may be that there are exemptions in law, so that if there are reasons to exclude someone in particular from a female space it can be done, but by that time it is likely to be too late to be of use to the victim of abuse, or of a violation of their dignity, safety or religious preference.
I see these issues as separate and entirely different from one another. It is not transphobic to want to protect women from those who want to use sex (as opposed to gender) as a way of changing and ultimately removing what it is to be female.