Trans issues and trans men, sexism
Trans men aren't inherently bad for identifying as men.
Being a trans man doesn't mean that you're automatically perpetuating the patriarchy.
In fact, many trans men have a deeper understanding of the harm the patriarchy causes than cis men because many had to experience it themselves at some point of their lives.
Issues often seen as "women's issues" often do affect trans men. Trans men get opressed by laws against reproductive rights and the lack of medical research on this type of body.
I've seen some hostility towards trans men and I don't think it is ok. Trans men have the right to speak up about issues that affect them without being silenced with "but you're a man, you can't speak about sexism".
Being harmed by the patriarchy isn't only for women, and if you experienced sexism that doesn't make you a woman.