The 🤏 emoji — signifying penis smallness — has become a pivot point for anti-feminist activism in South Korea.

According to the L.A. Times in "What’s size got to do with it? Mocking a man’s manhood spurs a reverse #MeToo in South Korea" (L.A. Times).

“Men’s rights” groups have taken to searching for the image included in various posters and ad campaigns, in a McCarthyistic hunt for companies, organizations or their employees sympathetic to feminism, targeting them with boycotts or a barrage of complaints....

The pinching hand entered the gender debate in South Korea in 2015, years before it became an emoji. That year, a group of South Korean women fed up with widespread misogyny on male-dominated online forums decided the best way to push back was to give as good as they got. They began referring to men by their genitals, as men had often done of women. 

They created male versions of online slang that was degrading to women, and reverted sexist idioms — “A woman’s voice should never go beyond the fence,” “Women and dried fish need a pounding once every three days” — against men. They ridiculed and belittled men based on their physical appearance, and often, the size of their appendage. The group of women called itself “Megalia” and chose as its unabashed emblem the image of a pinching hand.

ADDED: Why would anyone think that telling men their penises are small — deriding them for this characteristic — functions as a good approach to achieving feminist goals?

On a crude level, one could say men have been awful to women, so women are returning awfulness, hitting them where it hurts, right in their masculine pride; we're fighting subordination with humiliation. 

There is also the old notion — and I'm speaking only of how I've experienced in the United States — that a male with a small penis compensates by behaving like an asshole. I haven't heard this recently, but it used to be standard humor to say — when witnessing an aggressive male jerk — "He probably has a small penis." This would exert some pressure on men to behave better, lest they be thought to have a small penis.

But to push that theory is to give priority to a person's physical attributes: You are what your body makes you. That way of thinking isn't helpful to feminism.