Mental health issues are treated medically all the time. Drugs + therapy are common treatments for nearly all mental health issues. Who's to say that gender dysphoria (not dysmorphia) isn't treated the same?

And if someone wants to physically alter their body to match their preferred gender, what's it to you? Honestly why do you care so much? I can't help but imagine those like you as those codgy people with antiquated ideals, spewing hate and judgement because someone has tattoos or body piercings.