White supremacy is, by definition, a gendered project. Maintaining white hegemony requires controlling the reproductive freedom of white people who are identified as women, since white women are the only people who can give birth to more white people. Importantly, policing the reproductive freedom of white women ALSO requires policing the gender expression of everyone, since any LGBTQ+ gender expression threatens white racial hegemony.
THEREFORE, being transphobic, by necessity, means you are siding with white supremacists.
Please realize that.