The only way to tell male hop plants from female ones is to wait until harvest time. But, as mentioned, no one keeps male plants around except for breeders. Commercial hops are all clones of female plants.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk