by Chelsea StewartBuzzFeedBuzzFeed StaffI'm Chelsea, the Weekend Editor at BuzzFeed, where I cover everything from pop culture and politics to TV and celebrity news. 1. Sabrina Carpenter told a fan she didn't like their cultural cheer during her set, sparking widespread backlash that saw some accusing her of xenophobia - which Sabrina ultimately addressed on X. Christopher Polk / Getty Images 2. Justin Bieber spent part of his set literally playing old YouTube videos of himself and singing along.