@Elmithian They can't
jerk off to this so that's understandable.
But really this case is because the incompatibility of their personal taste (a.k.a fetish) with genderbend, it's like a straight guy got jumpscared by boku no pico and develop a trauma. Just like me got surprised by a sudden rape development by ugly bastard on a certain manga right when i start to like the girl, i was still a new in anime world back then. Fuck man that was really nasty experience, now i always checked the tags or the reviews when i have a doubt.