“That girl” isn’t even a pronoun. He didn’t substitute a pronoun for the girl’s preferred pronoun. He used an adjective and noun combo.
= = =
Yep.
I learned pronoun supremacy in 7th grade, over 60 years ago.
We wrangled every part of speech, diagramed sentences, and punctuated and capitalized collections of words into submission.
It stuck. Today I come to a screeching halt when reading the newspaper and its and it’s are improperly used.
‘They’ used as a singular pronoun just muddles ‘their’ communication; I have to stop and unravel before proceeding.
Well in fairness, homophones are of the devil.