Translation: "How dare you call me a mother? I'm tough and brave and strong, unlike flimsy, cowardly, weak women!"
Bennett doesn't seem to respect women to the slightest degree. This behavior would be appalling in a cis man - why is it OK in a trans man?
Overall, this is a battle that is destined to be lost.
Medically, the treatment given to the partner with the uterus who is gestating the child is going to be completely, completely different from the medical treatment given to the sperm donor.
And doctors and medical personnel, no matter how enlightened, are going to continue to call this person the mother.
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As a far-leftist myself, I sometimes wonder if articles like this are deliberately created to make us seem ludicrous and delusional.