I think you're wrong to be upset.
I think at this time it's for a child's safety that their choice of pronouns or expressed gender identity not be relayed to the parents.
Why?
Because if the child
wanted their parents to know then they would tell them. The child might not feel comfortable telling their parent just because it's awkward but it could also be a much more substantial fear of repercussions, punishment or even harm.
You have only to see how some people in this debate advocate hate and even execution to understand why it is worrying to out a trans child to certain kinds of parent.
Stop the hate.
Keep kids safe.