I sympathize with that. I work with two ftm trans and even though they pass pretty well you just know not everyone is going to let that go and they probably have to deal with people giving them weird looks, or even obviously looking for too long trying to guess at what gender they are.
And even when you have friends that understand and love you people can misgender accidentally by no malicious fault of their own, and even apologizing and working on that doesn't make it any less awkward and a call to attention. It's an every day difficulty in a lot of ways, especially in public.