transphobia isn’t feminism.
Fun fact! Trans people and, by extension, the concept of multiple genders exist cross culturally: from the Hijra of South Asia (whose earliest written record dates back to the 3rd Century AD) to the Māhū of Hawai’i to the Two-Spirit of North America (like the Navajo nádleehí or the Inuit sipiniq) to the Sekrata of the sakalavas from Madagascar to even the 5 gender structure of the Bugis from South Sulawesi Indonesia.
If your feminism is limited to the western binary system (that was initially brought into full in the 1400’s) then you are not only ignoring the existence of non-binary systems that exist across the world but you are furthering and perpetuating colonialist thoughts and beliefs.
Trans people have always existed.