It’s not about invalidation. It’s about the case of lost and mentally unwell people finding out about transgender, then find a welcoming community, that accepts them. They get presented a simple explanation on why they don’t feel like themselves and a path through that. If other people (like the parents) shed doubt on this, they can be called transphobic and face social consequences. So if someone grabs onto this, they get treatment in the form of hormone pills pretty much immediately under informed consent.

Differential diagnosis for mental health issues is never easy. One mental health issue can easily cause others. The major difference is that gender and being trans can become a big part of one’s identity. You don’t get that to that extent with other disorders.

Especially the overlap with autism is interesting and not obviouS. https://www.cambridge.org/core/journals/european-psychiatry/article/crossing-boundaries-unraveling-the-link-between-gender-dysphoria-and-autism/DB33E9208EF32A46C4AE83D9B673F498

Preliminary findings indicate that individuals with ASD may experience higher rates of gender dysphoria compared to the general population. Factors such as social communication difficulties, rigid thinking patterns, and heightened sensitivity to social norms appear to influence the experience of gender identity. Qualitative data reveal that many individuals navigate significant challenges in accessing appropriate support and validation, often feeling marginalized within both the autistic and gender-diverse communities.

I invite you to seek out interviews with detransitioners and people who used to work in gender affirming care, if you want to learn about Trans issues from someone besides activists.

That said trans people are real and some benefit from transitioning. The very charged political climate around this health care issue, creates problems for trans and non trans folk alike.