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Literally brainwashing.
I'll keep this short because I don't plan on having a full-blown debate about it, but -
Gender dysphoria and transgenderism is entirely dependent on how one defines "gender." There are 3 interpretations that I see often:
1.) Gender = sex
This is the traditional option. If this is how you define gender, then you can say that "gender dysphoria" would be better referred to as "sex dysphoria." This is purely a disconnect between the brain and the body's existences, and therefore, a mental health issue, the exact same as body dysmorphia, which is treated with counseling medication to attempt to correct the deviant mental state. As such, this should be applied to sex dysphoria.
2.) the social differences between men and women
if this is the definition you use, then there is no issue with dressing or acting feminine - however, the exact same people who claim transgenderism as valid have been attempting to undermine societal gender norms for years (and similar statements are centuries old, like the adoption of high heels for women.) However, in any case, this means it is entirely transient and ineffectual to reality: given all of this, this also has no bearing on the physical attributes of the individuals, and therefore any alteration to one's body should be treated exactly as one does with body dysphoria; hormone injections would be harmful and surgery would be extreme and superficial, and indeed unhealthy.
3.) gender is self-expression
This is how I most often see gender described by transtrenders, and it has only two points that need to be discussed: a.) if it is self-expression, then gender itself should not be listed on official documents and sex should be used instead; b.) physical alterations are used in the same way as body modification, like piercings and tattoos, and is the most extreme form of body modification.