HandScreen 12:53
It's common courtesy to call someone what they want to be called. It is unspeakably rude, ignorant, spiteful and hurtful to do otherwise, and your daughter would do well to learn this lesson.
HandScreen 12:54
Yes, being transphobic is shameful. She shouldn't be transphobic. Any sort of bigotry is and should be considered shameful.
HandScreen 13:04
But the OP says the daughter isn't making a mistake, she's being a bigot because that's what she believes. Absolutely unacceptable.
The 13 year old girl must be taught to comply.
Obey others without question.
Deny her herself and offer to be a support human valadating the beliefs of a random child in her school.
So nice to #bekind
catbsfhs
Also if someone mentions a friend in conversation and we don't know their gender, we'd often refer to the unknown person with they/them pronouns despite them being a singular person. So it doesn't sound particularly weird or grammatically incorrect to do this with someone who has asked that you use those pronouns.
She and he are sex indicators, as in she = human with vulva or he = human with penis.
In English they singular is used to indicate that the sex of the human is unknown. If one speaker knows the sex of the human the pronoun for sex is used as it conveys a point of information.
A single animal of unknown sex may be referred to as an it. Using it for a human is being extremely rude, but they for a human can be nuance of language.
Singular they conveys human sex specific information about a lack of familiarity with the person, however when a speaker uses they for human who's sex is known it can indicate social distancing.
My requesting you use my choice of third party pronouns is an act of control. I get to control how you are allowed to describe me when I am not there.