小时候老以为曹雪芹是女的小时候老以为武则天是男的
[xiăo shí hòu lăo yĭ wéi cáo xuĕ qín shì nǚ de xiăo shí hòu lăo yĭ wéi wŭ zé tiān shì nán de]
This nickname is based on a common misconception made by young Chinese children. Cao Xueqin, the author of the famous classical novel 'Dream of the Red Chamber,' often leads children to assume he's female due to his intricate depiction of feminine sentiments and lives in the book. And for Wu Zetian, the only female emperor in Chinese history, children often incorrectly identify her as male due to societal stereotypes and limited historical context.