I don't think gender dysphoria is comparable, but I'm going to be incredibly blunt: If a person says that they feel that they're being monitored by the little green men that only they can perceive... is 'how they feel on the inside' sufficient for anyone else to accept that they are not schizophrenic? If someone feels like Ryan Reynolds really truly loves her deep down inside, but just can't let on because his girlfriend would get jealous, and that's why she has to follow him and arrange for meetings that look unimportant to observers but she and Ryan both know they're actually delicate trysts... is 'how they feel inside' reason for anyone to be expected to believe she is not a stalker? If a devout pentecostal truly feels that god is communicating through them when they speak in tongues, does that suggest that the rest of us should accept their feeling that god is real?
Like I said, I'm not comparing gender dysphoria to schizophrenia or a stalker's obsession or religious zealotry. I'm quite certain that they are experiencing something that causes them sincere anxiety and distress. But the treatment for that distress seems to be the expectation that everyone else accept their feelings as being more true than observable reality.
There are reasonable lengths I think we should go to in order to alleviate unnecessary distress in other people, if we can. Infringing on the rights of other people isn't really a reasonable length though. And I get even more skeptical when the people asking me to suspend reality in favor of their feelings are people without a diagnosis, without any professional treatment, and who are making no effort at all to adapt themselves in order to alleviate their own distress.