Is Trans fear driven by a fear of being deceived?

Imagine if a lesbian woman discovered that the woman she was getting involved with turned out to really be a straight man in drag. I get the impression of a double-standard: that no one would take the attitude of “ha-ha, you thought were kissing a girl! Isn’t that cute and funny and precious?” that seems to be the default when straight men are deceived by trannies. A percentage of militants would cheer if the lesbian woman castrated the man.