Rapping about bath salts is probably not going to get you very far with the judges on "X-Factor," least of all Demi Lovato.

At auditions in Greensboro, N.C., yesterday, the singer shut down a group who chose to incorporate bath salts into their routine.

"She wasn't having any of it," a source told E! News. "She said 'It's really irresponsible to be rapping about drugs in front of kids.' Then they tried to make excuses and Demi said, 'You talked about bath salts, I heard you.'"

She then asked the group the leave the stage and the audience booed them.

Jeez, tough crowd.