Marcos Galperin, the founder of Mercado Libre, had two words for New York mayor Zohran Mamdani on the anniversary of October 7: fuck off. The clash went up on the third anniversary of the 2023 attacks. Mamdani had marked the date with a message about the war in Gaza. In it, he wrote that the suffering had not begun or ended that day, saying it continued through what he called the devastating and ongoing genocide committed by the Israeli government in Gaza. Galperin's answer to the post was as direct as public replies get. The two men sit at opposite ends of this argument, and neither showed any interest in softening the distance between them. Three years in, the fight over how the date is remembered is still bitter enough to draw a billionaire and a city mayor into open, profane conflict.