I didn't say that, Dominik did. But I'm glad you brought that up because I meant to ask him if he really said it or if he was just joking. :-)
At first even I did not know if he really said it or if he was joking, it took me some time to realize he was joking. So was I. Being a statistical analyst by profession, I deal with matrix algebra often where we do have norms and equality of matrices. :)