There’s this delusion amongst transphobes that they can “always clock a tranny” and that they’re never wrong when they decide that someone is secretly trans because they have a more prominent Adam’s apple or something equally stupid. Of course the truth is that they’re wrong constantly and are just idiot bigots, which this illustrates rather poignantly unfortunately. They don’t really know who is or isn’t trans, they just want to pretend they know so they can feel vindicated by “recognizing” trans people, and they convince themselves that trans people can never truly blend in to society. Because if trans people really were capable of being indistinguishable from cis people, then that would mean that at some point they might have, gasp, treated a trans person like a human being and used the proper pronouns. The horror.
Of course trans people shouldn’t have to blend in, they shouldn’t have to pass to be treated as the gender they identify as, or with basic human decency.