@Mylittlesandwich
This is what I don't understand. Nobody is stopping you from referring to yourself or other people you know by the phrase "mother". If you called me one I'd feel you were being a little formal but I wouldn't be offended. By allowing people to use other terms it's just allowing them to be acknowledged and accepted. Nobody is going to be arrested by calling themselves a mother.
No one is stopping trans people from referring to themselves in any way they wish.
Transmen can identify as transmen and be referred to as such with all their healthcare etc if they decide to do the distinctly unmanly thing of having a baby and the hormone treatment they have received allows them to get pregnant and sustain a pregnancy to term.
It is extremely questionable if doing this is in line with the legal GRC declaration of 'living as a man until death'. Men cannot have babies so whatever definition you manage to find of 'living as a man' is unlikely to include gestating a baby but hey ho.
'Mother' is a legal term that confers automatic primary parental responsibility whether we like it or not. When we make laws we have to use exactly the correct language that has exactly the correct meaning otherwise we leave it open to challenge. If a maternity law is left open to challenge, who will feel the detriment? It will be women.
People includes men and women. 'Women' and pregnant mothers only include women. This is important.
I am intrigued as to why you are so angry about this thread? What specific harms do you think will be suffered by how many people?