Jeatyn, I have a sister like that and she got cut out of my life well before transition or I'm sure I'd be hearing the same sh*t.
I definitely wouldn't lie to my kids about their origins, and with your daughter I'd treat it matter of factly. Daddy gave birth. It will come up when she's little and you're not the only dad to have given birth.
With strangers or even friends I'd prefer to be stealth with, I've just told people I'm divorced, and they assume that I was married to a F; I've also said to strangers that *she* is no longer with us (and they assume she died, which is fine with me). My kids are older and understand why I want to be stealth, so they tolerate bending the truth with people who aren't important. My daughter tells her casual friends that I'm her uncle (she can't quite do the 2 dads thing), but with people she really cares about, who are very important to her, I don't mind her discreetly disclosing. She's done that with one person, and he lives abroad, so not like he will out me to the world.
But I agree with the advice about never lying to your kid(s). They know when you are bull->-bleeped-<-ting and wonder why, and wonder what the deep dark secret is. And if they know the truth, nobody can sneak in and inform them of the truth; they know.
Jay