Hey AJ!
My names Elizabeth and I'm knew to this as well. I'm the girlfriend of an ftm so I'm at the other end of the stick. I suppose it's not easy for us to open up about something that not a lot of people understand. The world is a cruel place sometimes, but then you have awesome people who make it amazing lol. And you have the support of your girlfriend. I'm sorry about those people saying cruel things, and maybe your girlfriend should rethink her own support systems if they can't accept the man she loves.
Because my boyfriend is pre everything and this is only the beginning, I haven't told my family or friends yet, just as he hasn't told many people either. But as the time approaches it becomes scarier. And I commend your girlfriend for having the guts to do so and stand her ground. In the end be proud of who you are and how far you've come, and always remember you have your girlfriends support, which is much more important than that of her friends.
People come and go in our lives, but once we find that love, it lasts forever!
I doubt I helped much lol, but my overall purpose was to say welcome! And I'm here to talk anytime!