Well in my view his position is a veritable army of scarecrows already. That aside...
Pain: This is an internal feeling we cannot objectively verify. Instead, we expect medical professionals to apply specialized training and experience to the report. We expect them to carefully consider the available evidence, and compare it to other similar reports by other patients. We expect them to closely study the patient's behavior, the nature of their demands, and their apparent reaction over time to the medication prescribed. They won't get it right every time, but we do not therefore give them license to blindly accept or dismiss the report without properly examining the subjective and objective evidence available to them.
Homosexuality: This is an internal feeling that we can objectively verify. But most of us aren't going to bother. You say you're gay, I'm not going to start showing you photos of studmuffins to see if you get an erection or not. You say it, I believe it, that settles it. Mainly because it's nothing to me, what you get up to in the privacy of your bedroom with a consenting partner.
Fursona: Another internal feeling we can't objectively verify. We also don't care, because again, it's nothing to us if you want to cavort around in a faux-fur blue fox costume. As long as you're not demanding public policy changes, like fursona representation on corporate boards, or special restrooms for fursonas, constructed at public expense or mandated by law for private facilities, your internal experience or feeling and its outward expressions are a non-issue.
Gender dysphoria: See "fursona", above. (This, by the way, is an analogy. I don't expect it to go very well.)