Amen to that, but I think the reason that a console war exists is a bit different than why trash talking exists. I think that in a console war, most people are trying to justify their purchase. Shitting on another console can make it easier to not buy it and just say that your purchase was obviously the right choice when in reality, none of us really know how well the consoles will really stack up to each other at the end of their lifecycles.
Some of us are content with just ignoring all of the great things on another console and just sticking to what we've bought. Other people do the same thing for a different console and from there, trash talking springs up. That definitely has to stop.