It's so inappropriate for a parent of a 23-year-old to publicly speak on behalf of/instead of their adult child unless the adult child is intellectually impaired or suffers from a disability that makes it impossible for the adult child to communicate and speak his or her mind on his/her own.

I was 11 the first time I had a major viewpoint conflict with the powers-that-be who then played a huge role in my life (the nuns & priests running the RC convent school in the US I attended in the 1960s). They had asked me to write a speech for a special event in the community - but when I handed in my speech they completely changed and censored it. My parents went to the school and parish with steam coming out of their ears and told the nuns and priests that if they wanted me to give the speech then they had to let me speak my mind. But my parents never, ever proposed to speak on my behalf or to argue my POV. They helped me hone my thoughts and words, and they gave me emotional support, but basically they left it up to me to figure out and express my own views.

A similar thing happened when my younger brother in first grade circa 1966-7 responded to his teacher's ranting that "revolutionaries are destroying this country" by raising his hand and very politely asking, "But wasn't it revolutionaries who founded this country?"

When my own children were 23 or 12, if I had ever tried to speak on their behalf, they would've died of embarrassment and given me lethal side-eye as they shouted, "Mom, how could you?" along with many more unpleasant things whilst they slammed endless doors and stroppily stomped their feet.

It's preposterous that Cynthia Nixon's decision to go to the press to give the whole world the impression that her adult child is an immature imbecile with inflexible ideas is now being viewed as an example of good parenting! But worse, CN has now outed her adult child as someone who still lives in Harry Potter pretend fantasy land and can't cope with the fact that Harry and Harry's world are the imagined creations of a RL human being who happens to have some views that CN's adult child doesn't like.