((not sure if you're alrdy familiar, but, this type of thing—e.g., "I'm afab identifying as an amab transgurl"—is one of the pillars on which the "BioTrans" satirical social media profiles are built))
Hahaha yes!
Of course, one of the biggest issues is just holding them to being consistent, since when anything makes their cognitive dissonance flair up, they just call you a bigot to derail the whole thing.
This is kind of one of my go-to comebacks when people insist there's no difference between "cis" (blech) women and transwomen, that sex isn't real/important and that how you identify is the only thing that matters. 'Can I identify as a transwoman then? What makes me not one?'