When it comes to AME's, he or she might be "trans-positive", but the experience will probably not feel the same as when you go to see a regular doctor who is trans-positive. Because the AME has to grapple with the FAA's standards, he or she is likely to use verbiage that will feel negative (like "disease" this and "disorder" that), in the context of asking you nosy questions that will probably feel very unfriendly! You -- and the doctor -- might both know that there is absolutely nothing wrong with you, but the doctor has to put together paperwork to document everything to the FAA, including stuff about medications and procedures and diagnoses from the past. So don't be alarmed by this.
That being said, AME's are people, and so I'm guessing there are some out there who really are "trans-negative," who might actually believe there is something automatically wrong with you... and you'll want to avoid those.
The best way is probably to schedule what we like to call a "consult" with an AME, which is a sort of "rehearsal" exam but before submitting any FAA paperwork. You can size up a potential AME and get your questions answered. Bear in mind the above: a doctor who asks nosy questions, and uses words like "disease" or "disorder" with you, may not necessarily be trans-negative... It just might sound that way, depending on their demeanor. (Doctors are not always the best at choosing words to make people feel at ease!). They have to ask the nosy questions, in order to navigate the FAA.
If they ask you to fill out a form called "MedXPress" get a confirmation number and give it to them, politely ask the person on the phone that "I'd just like an appointment for a consult for now. I'll do the MedXPress form later." It means you'll probably pay for two appointments rather than one, but this is probably worth it, for peace of mind. Do not accept any AME that demands you provide a MedXPress number first, even if they say it's standard procedure for their office. If they refuse to schedule a consult, thank them for their time and try someone else.
Good luck!