Isn't that one of the primal fears behind anti-trans sentiment and action? If a God fearing straight person can't tell the difference and was "deceived" into finding a trans person attractive then it would shatter their comfortable illusion that the world is full of simple binary dichotomies.

male/female good/evil straight/gay us/them pets/food Etc.

So rather than accept the admittedly often uncomfortable ambiguity of living in a messy universe, they blame the deceiver (or Deceiver), exclude them, ostracize them, and then argue they don't really exist