Yes, insisting that transgendered people’s chosen personas are ‘fake’ is transphobic. Is this a difficult concept for you?
I mean, I assume you practice no more than one religion, right? But if someone gets married, you can learn to refer to her as ‘Mrs.’ instead of ‘miss,’ no matter if their ceremony was Catholic, Baptist, Mormon, Hindu, or Wiccan?
If someone gets promoted, you can learn to refer to them as ‘Detective’ rather than ‘Officer,’ right?
If you know a Timmy who graduates high school and decides he wants to be ‘Tim,’ you can learn to change, right?
If someone graduates Med school and insists on being called ‘Doctor,’ you don’t bitch that they’re not, do you?
In none of these cases do you insist that you can refer to them the way they used to want to be referred to, right?
Oh! And if you take your kid to the Mall for pictures at Easter, you don’t introduce them to ‘Some College Student’ rather than ‘the Easter Bunny’ even if you know that she’s definitely not the REAL Easter Bunny?
At Disneyland, do you take you kid to get a picture with ‘Some actor’ or with ‘Mickey Mouse’?
But here, suddenly, you reserve the need to insist that you know their identity more betterer thanthey do. Because reasons.