"Sad... As if we didn't have enough people glamorizing eating disorders already. Bottom line, it's not 'cool' or 'artsy' at all," Lovato tweeted in response to the performance.
Lady Gaga, meanwhile, has consistently defended what went down on stage as art—and nothing but art.
"I have struggled with an eating disorder for over 10 years and I take that very seriously, I take the struggle of others very seriously," Gaga told E! News Friday.