Because there are numerous male people in positions of influence who are supportive of male people with transgender identities being treated as if they are female. It doesn’t matter a jot whether those male people are heterosexual, bisexual or homosexual.
They do so because of their political ideals, their future aspirations or because they will support any male person above a female person, or simply cannot understand the needs of female people. There are plenty of reasons why those male people will prioritise male people with transgender identities above female people.
However, the issue for these three young women and the negative impact on them is not restricted to the group of men you seem keen to restrict the issue to.