HerOtherHalf you'll not be surprised to know the word transgender doesn't appear in the Bible. However, as said above, wearing the clothes of the other sex is mentioned as not to be done in the old Testament. But there are loads of things in the Bible that many Christians do not take literally.
"He couldn't possibly be making shit up to support his personal bigotries." You may see it as bigotry but either way most religious people do have a reason for their beliefs, even if you, or I, may not agree with them. Just as people who believe themselves to be 'born in the wrong body' or whatever is said have a reason to believe this.
I feel very sad that the religious angle is really not very helpful here (I think that as a Christian).
For me the bigger picture is why so many young girls feel they identify as boys. I don't know for sure but for males identifying as female this is spread over a wide age range (I've heard of men in their 60s and 70s 'coming out' as trans - we all know one famous person!).
But for females it seems to happen a lot more around childhood, puberty and early adulthood. I could be wrong, I'm not trans or an expert but I have read a lot. I think we need more research to understand what is happening culturally. These things (in the media) begin debate but we also need research; and debate gets shut down or turns into a slanging match.
Some parents are utterly baffled and struggling, as are some children/teens; and it is not just trans teens threatening suicide or acting on it. Adolescent mental health is in a very bad state for some people.
I am not supporting the teacher, just wanting to debate this. But i am concerned of precis=dents being set. In Canada you can face a large fine for 'misgedering' someone. That reminds me of the blasphemy laws in some countries where people can be fined or perhaps persecuted for not agreeing.
I wonder if we can all agree we are all concerned for the lives of trans children. That is why I would support their choices as much as I felt able, and certainly use a word if it helped but I do also see that those who feel unable to do that are not necessarily just doing that because they don't care.
I hope that makes sense.