Specifically at them, yes, but based on my weak memory at both. My recollection of Monster Magnet isn't so clear as of the other, so I couldn't say definitively one way or the other that it's a crime against music, but if they're anything like System of a Down then they definitely deserve the description. The statement really works as a general rule anyway. Go listen to some Led Zeppelin or Social Distortion or something, kids, leave the bad ear-bleeding noises to the juvenile delinquents.
Christ, now I've got that awful "Toxicity" song in my head again. GET IT OUT! GET IT OUT!