The most transphobic people I know are often other trans people. So distasteful do they find their own TS/TG reality that they idealise cisgender privilege to the point of other convincing themselves of an uncomplicated identity, in spite of their own personal histories often proving rather complicated gender relationships, to one extent or another. This is not merely cissexism, as their actions require the erasure of of their own trans histories, just as much reconstructed TS/TG history of pre-Twentieth Century transgender people had been erased, and so they turn the transphobia inward, on themselves, and maintain a status quo of projecting the cissexist ideal outward.
This becomes most unfortunate in pagan and polytheist circles, where the 20th and 21st Century “ideals” of uncomplicated TS/TG people is introduced into pagan and polytheist communities, and the self-hating TS/TG individual expects to be given the exact same options as the cisgender individual. To be fair, yes, often the denial of trans women, in specific, to various “women’s mysteries” is an act of cisgender people actively hating transgender women, but the fact still remains: Most women experience menarche, a mystery no trans woman will ever endure. A man who will never emit seed will, too, be unable to touch that particular mystery. The transgender individual, on the other hand, does have her and his own mysteries, and these can be offered in certain sorts of circles to shed additional light on a the mysteries of manhood and womanhood, because the TS/TG individual does live in that liminal space that, even if as socially uncomplicated as “man” or “woman” as possible, is physiologically in-between, and the physical and spiritual are so thouroughly interconnected that to deny the effects of one on the other is to practically invite spiritual sickness, which may very well manifest physically, in some.
For an overwhelming majority of trans pagans and polytheists, to present oneself as a uncomplictedly male or female is to present oneself as spiritually unwell, unstable.