They have shown up whenever women rallied against sexual violence and gender biases in South Korea. Dozens of young men, mostly dressed in black, taunted the protesters, squealing and chanting, "Thud! Thud!” to imitate the noise they said the "ugly feminist pigs” made when they walked.
"Out with man haters!” they shouted. "Feminism is a mental illness!”
On the streets, such rallies would be easy to dismiss as the extreme rhetoric of a fringe group. But the anti-feminist sentiments are being amplified online, finding a vast audience that is increasingly imposing its agenda on South Korean society and politics.