Why is their perception so off? It's weird.
Obviously for these men, people know they're men. And they know it, too.
So why do they think that the odd person doesn't know it?
I know they might do a very good job of pretending, but nonetheless. Why would these men automatically assume it's a real belief, rather than a good pretence, given they must in a minority.
I guess it comes down to the overwhelming desire, just making them blind.