So your argument is that those who suffer from systemic forms of injustice and inequality should just "adapt" to injustice?

It also seems like you are misunderstanding the differences between sex and gender. Sex is biological, so yes you are born with a specific physical biology (no one is arguing that you're not). However gender is a socially constructed concept (i.e. what is deemed feminine and masculine) and these things have been constantly in flux throughout human history.

Your point that a person's body will continue its biological process is exactly the point, menstruation is a natural process. However, if a trans man must continue to experience this natural biological process, wouldn't it be a relatively easy adjustment to include him in this space as well? Does inclusion really harm you? Or does it just make the world better for those who seek to feel validated and accepted for their being and identity?