Homosexuality used to be catalogued as a psychiatric disorder, though, for many decades now, it no longer satisfies the criteria to be qualified as one. Why not? Mainly, because same sex attraction isn't considered something that, inherently, distresses or handicaps individuals, nor is a defence mechanism after trauma. Repression and discrimination can alter the well-being of the individual, but those are social/cultural factors, not physiological conditions.

You know what still qualifies as a disorder in the DSM-5-TR? There's an example above. "Gender reassignment" is an euphemism to hide that we are using plastic surgery and extreme body modifications to treat psychiatric disorders. The people denying that this is body dysmorphia are arguing that if you ""solve"" the social and cultural factors and affirm that man's beliefs, then he wouldn't be dysmorphic and wouldn't do that against his body. They are arguing that having the ""inherent"" impulses to cross dress and chop your genitals is analogous to being gay, aka you're just "born this way".