"Fuck you, you'll go to hell for wanting girly bits"
I am fucking tired of this sort of bullshit. If you're in any sort of profession where you're going to be interacting with a wide customer base, you're going to meet people whose actions you disagree with. That's pretty much a given. That doesn't mean you get to send them mail telling them they're going to hell for it. It's actually perfectly acceptable to keep your views private. It really is, I promise. Especially given the very limited scope of the interaction you had in the first place. Honestly, it's not like this guy was required to enthusiastically approve of her gender. He wasn't being asked to be her friend. All he had to do was file some fucking paperwork and shut up.