I couldn't help but cringe when I saw this live. Mario was only doing his job. These girls are paid millions of dollars just to show up, give critiques and say a name once in awhile. It wasn't that hard to do.
If Christina had done this to Carson on The Voice then it would have been all over the headlines and she'd be America's #1 bitch with an attitude problem. Not to mention that every fat, ugly and lonely housewife on Facebook and Twitter would SEETHE like no tomorrow.
Demi got away with it.. but maybe it's because she isn't as popular as Queen X and only 5 people watch the X-Factor per episode.
I know a few professionals in the Entertainment TV industry who say Demi is one of the bitchiest celebrities in music. Comes in with a big attitude and gives interviewers death stars. This isn't unexpected of her.