Women who insist that trans women are not women often object to being called “cis women” under the false assumption that it somehow undermines their … - Julia Serano

Trans women differ greatly from one another. Perhaps the only thing that we share in common is a self-understanding that there was something wrong with our being assigned a male sex at birth and/or that we should be female instead. While some cisgender people refuse to take our experiences seriously, the fact of the matter is that transgender people can be found in virtually every culture and throughout history; current estimates suggest that we make up 0.2 – 0.3% of the population [or possibly more]. [...] In other words, we simply exist.

While gender socialization is quite real, all of us are capable of overcoming or transcending the socialization that we experienced as children. And gender socialization doesn’t simply stop when one reaches adulthood: All of us are constantly facing gender-related social pressures, expectations, and obstacles throughout our lives. If you believe that these statements are true for cis women, then they also must be true for trans women.

People usually gravitate toward single-issue activism because they are unconcerned about forms of marginalization that do not personally impact them.