Just some food for thought. Gender dysphoria and transgendered are a diagnosis that will stay. For the majority of the population there is no doubt - they are male or they are female. That's easy, but there are very well documented cases of several variations of this. It is not black and white and any medical textbook will show you this. The question comes down to what determines gender can you tell me? Is it penis vs vagina? well what about complete androgen insensitivity, how about congenital adrenal hyperplasia. How about mutations of the SRY gene? Here are some others - 17a hydroxylase mutation, 5a reductase deficiency, gonadal dysgenesis, LH receptor deficts, SF-1 mutation or MAH mutation. In extreme cases these individuals are XY and have a fully developed vagina. They are called female at birth - what about them. How about situations of XXY or XO. What about ambiguous genitalia at birth? This is not a quick and easy as just saying male and female at birth. OK, so what about karyotype or XY vs XX. Well, that isn't as straight forward either. As I noted above there is Klinefelter's syndrome, Turner syndrome and there event people with XXYY. What about those people - male or female? a lot of these people have no clue they have these conditions until puberty.
For the majority of people it is easy - male or female, but you cannot blanket this with every person in the world. So if phenotype and karyotype may have their limitations - What about how they feel? Well there is very good studies in well-respected journals that there are individuals who truly and honestly believe they are of the other gender. Where do they fall? They may have any of the above or none of the above findings at birth, but if you delve deeper they have a reason for feeling that way. There are twin studies that demonstrate there is a genetic component to this. Other countries in the world identify a third gender and respect these individuals as such.
Whether you like it or not this exists and there are a lot of people who benefit from therapies for gender dysphoria and it is very well documented that not only does treatment works, but they have better outcomes. This is why it is becoming standard practice. Gender dysphoria is a real thing just like depression, anxiety, PTSD are all real things and require recognition and treatment. People with depression just don't "get over it." They need help and medications are necessary at times to help correct that. PTSD is a real thing. GD is a real diagnosis.
Do not blast away saying this is not real just because you don't understand it. the medical world is still working on it, but the more evidence the medical world picks up the more and more we are finding there is legitimacy to this and not the other way around.