Transgender issues should not be taught in schools. Children are too young to be 100% sure that they want to be a different gender. Propaganda like this will make some children take decisions they later regret.
As a society, we need to decide whether someone actually CAN change gender. At the moment we legally can, but of course that doesn't extend to athletes for example - a male athlete who "became" a woman would not be allowed to race as a woman in the Olympics. Many women on Mumsnet have written that they are not comfortable with "women" who were born male using the female public lavatory, for example. (I think that they are missing the point - their actually objection is to being sexually assaulted in a public lavatory, not the gender of which their attacker is most comfortable with!)
Either we must accept that a person CAN change their gender, in which case they should be treated as a person of their new gender - no ifs, buts or other caveats - or they CANNOT.
But... A lot of people are not comfortable with this. Surely it is a bigger change for a woman to become a man than it is for a white Scottish woman to decide she is actually a black woman from the Democratic Republic of Congo? Biologically speaking, she is closer to being a black woman than she is to being a white man.
I am not saying that it is right or wrong. But either we CAN change the fundamentals of our physical being - with gender realignment being probably the most extremely fundamental change - or we can't.