“Before, I thought some BTS songs were pretty good. Now, they seem to be covered in excrement,” said a commenter on the microblog service Sina Weibo. “Insulting China is absolutely not allowed.

BTS and Twice were the big winners of the 2018 Mnet Asian Music Awards (MAMA), the biggest K-pop music awards, which was held at Hong Kong’s AsiaWorld Expo on Friday. BTS was crowned Artist of ...