Your response is amateurish and reactive.  I'm not a Mariah fan but I don't blame her for what happened.  This was a technical failure - the the music wasn't being fed back to her.  The speakers point away from the stage and as a result, it sounds far off when you're on the stage unless you have working in ear monitors.  If she starts singing, she has two options: a) sing the song with no point of reference - guaranteeing she will be ridiculed for not singing in tune/on time, or b) let everyone know there is something wrong, and still be ridiculed by people like yourself.  She picked "b".  Happy New Year.