嘲羊群众

Meaning

"Xiao Zhan greened half the entertainment industry" (肖战绿了半个娱乐圈) refers to how after "The Untamed" became a massive hit, many people fell for Xiao Zhan, confessed their love for him, and thus "cheated on" (felt sorry to) their original idol crushes. In Chinese, "绿" (green) means being cuckolded, so "greening half the entertainment industry" means "stealing fans from other idols."