Trans women are women. We suffer under patriarchy too, indirectly before we transition and directly after we do. We also suffer under cisgendernormativity throughout our whole lives.
We are not the enemies of women. We are women. Cisgender women and transgender women share female solidarity, and we are and always will be allied. Cisgender women and girls (and those perceived that way) are oppressed through patriarchy and misogyny their whole lives. But we suffer from it too. We should have solidarity for each other's lived experiences. Its the transphobic people who are trying to portray us as enemies. They are wrong. Any feminist, any enemy of patriarchy, understands how transphobia negatively affects cisgender men and women too.