They did the same thing with her back when they were pushing the narrative of her learning to play games and "take turns." Abbie would show interest in a game...and in would swoop Asa to suck all the fun out of it by telling her she was doing it wrong, and forcing her to play it the "right" way. It's their relationship with her in a nutshell. An utter lack of the imagination required to understand that she may enjoy things in a different way than they do, and an obsession with forcing her to mimic neurotypical behavior, because "Abbie becomes more neurotypical" is the the only type of "success" they can accept.
I hope you would not say such a rude thing to a child's face if they voiced their preferences to you...
I can't believe fully grown adults are up in here getting unhinged over a child asking to, uh...be called a different thing? You must have absolutely tit yourselves when you learned about nicknames. "You're a Robert, not a Bobby! You were born a Robert, dammit!" Did you know some people change their names entirely after their married? It's a travesty. And some people retain their legal names in face-to-face interactions, but use fake names on the Internet!
That's right, my name isn't really Bready. I hope you can handle the shock.