Why does it matter?
It would matter to me that my child is not being taught something that is not reality.
It would matter to me because of safeguarding (see above).
It would matter to me because I believe all ideologies should be kept out of schools apart from teaching them as examples of ideologies.
Rather than what they have in their pants.
I wouldn’t care about what’s in their pants, just what sex they are. HTH.
You could explain the teacher’s sex is female but their gender is non binary
Gender Identity is a belief system. I would have to explain it to my child that their teacher believes something that there is no evidence for.
which is why they want to be known as they, and that it’s important we respect people and what they want to be called.
I would explain (in an age appropriate way) that 3rd person pronouns are sex-based and they is used for plural or when you don’t know someone’s sex, and when my child was talking to me I would ask them to refer to the teacher as the sex they are. I would explain that pronouns being gender based is a recent ideological belief that is being imposed on us and demanded of us and it is not respectful to children to ask them to deny the reality they see with their own eyes.
You could also ask the teacher / school for advice on how to explain it so that you are consistent.
I would ask the teacher why her feelings trump reality and if she truly intends to gaslight a whole class of young children into believing she’s not a woman. My consistency would stem from grounding my child in reality that humans cannot change sex.
You could also explain it’s rude to speculate what genitals people have.
No. I would not. It’s not rude to wonder what sex a person is, and for a child, there are simple ways to understand this before they’re old enough to understand pelvis size and physiology.