The way I see it, you can't really get tired of something that will never end because it will never let you get tired of it. This is just the natural order of baseball fandom. Yankee fans hate Sox fans, Mets fans hate Phillie fans, Cubs fans hate Steve Bartman. You can't really stop it either, though I do agree the personal mudslinging is a bit childish, as well as drawing away from the original rivalry to create something completely different (I believe that's the aspect you refer to). Becoming a pacifist doesn't ensure the end of war, but instead solidifies its presence.