it’s a feminist movement, in backlash to misogyny and pro-natalism in South Korea (it’s becoming more widespread, though). The 4Bs are the “four no’s”:
- no dating men
- no sex with men
- no marriage with men
- no childbearing
It gets a lot of pushback and is called selfish etc. but women are very angry & upset that the government only sees them for their reproductive use, and it’s reasonable to not want to date someone who doesn’t view you as human.
It’s only really fine if someone calls me an appearance-based compliment if they’re my partner or a woman that I’m close to.