Heh, i've had this happen to me in the past as well. It's a waste of time to try and teach those ignorants, don't do it. I've stopped long time ago. Instead, i prefer to have fun with them and, for example if he was to say the same BS "xbox has twice the power of a PC", i would respond with a "Nah, last time i heard it was 3 times minimum" or sth at which time he looks at you with a "wtf" sort of expression and says something like "you don't say man, wow".
From your example it looks like he was one hell of a stubborn mule. I bet that if you were to grab the console and smash it to his head, he would add "see? and it's better built too"