The joke is that it's obvious but these morons pretend it must not be because "she hasn't said she is" since one of the cult's tenets is that you (not even if you're a doctor) can't tell from looking at someone.
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This reminds me of one of the coldest moments of TV I ever saw, on the show Chopped. A little cocky shit of a contestant put up a pork loin dish that didn’t look very good and the judges let him know. And then…
Shit: “I’ve cooked this for all my friends before, and they all told me they loved it!?”
Judge: “Yeah, they were lying to you.”
The look on his face when his soul was snatched and world crumbled…

That’s what I want to say to this woman.
“She had no idea I was trans.”
Yeah, she’s lying to you. This is why some women have gatekeeping behavior towards MTF transgenders. A woman would have known that was a lie.