There's an element of competitiveness, too. I worked in a hotel, mostly with women. My supervisor, a woman in her 60s, praised me and the other male workers, saying that the women were jealous, rivalrous, and always fighting amongst each other. "Men are easy!"

Meanwhile, I had no problem working with any of the women (although it's true, they were cruel among themselves), but when I had to interact with men in other departments, it felt like some macho standoff. It's like when you go to shake a guy's hand, and he pulls your arm and crushes your hand, but baked into every interaction.