Why do men on gag claim that men can easily spot transwomen when so many transgirl on YouTube have experiences of guys not knowing they were trans?



So many men on gag claim that it is so easy to spot a transwomen and yet a quick youtube search for "he didn't know i was trans" shows a ton of stories of guys making out with the transwomen and chasing them only to find out they were born male later.
Why do men on gag claim that men can easily spot transwomen when so many transgirl on YouTube have experiences of guys not knowing they were trans?
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