As you are not a doctor or otherwise employed in the psychological research field, you are unable to comment or critique on any medical research with any credence whatsoever unless you educate yourself and give medically relevant arguments for your statements and beliefs. (Sources are also relevant.)

Gender dysphoria is real, not made-up, and has been proven to exist by many medical research papers on the topic. You denying its existence is not "an opinion" or "your freedom of speech", it is factually incorrect and therefore misinformation.

Ironically enough, genetics is what causes gender dysphoria. Biology is a lot more complicated than the highschool level you are familiar with. The current medical hypothesis on what causes gender dysphoria is that it is an imbalance in fetal development in the womb during pregnancy. The brain devlops later than the primary sex organs and if there is a genetic fault that makes the 'fetal hormones' fluctuate between male and female then it is possible for the brain to develop like a typical female brain while the sex organs are that of a typical male, and vice-versa.

The statistical result is a spectrum of male and female with some people falling somewhere in the middle. Life isnt as binary as you would like to believe. Not everything is black and white, it has gray areas like everything else in life.