I’m a Milwaukee native who has lived the majority of my adult life in Cubs territory, and for the last 14 years, in a mixed Cubs-Cardinals territory. Moreover, both of my parents grew up within 15 miles of the Illinois-Wisconsin border and grew up with the rivalries. There’s always been a mix of fans of Chicago and Wisconsin-based fans in southeast Wisconsin. Cubs fans used to come to County Stadium in the Braves days and vice versa. I grew up in the late 70s and 80s and Brewers-White Sox games could be, ahem, interesting. Saw a lot of fights. Add other rivalries into it too. Packers-Bears was intense when I was young with the Bears dominant. Most Cubs fans are also Bears fans. Don’t think that doesn’t carry over. My read on the outsized egotism from Chicago fans is that comes from an insecurity based on the fact that a city of their size, in nearly all sports, has won comparatively little. They get bagged on by cities they compare themselves too, NYC in particular, who look at them as little brothers they would never think of themselves to be. So they take their insecurity out on other Midwestern cities, but in particular, Wisconsin’s two pro cities. And understand the demographic differences in Cubs fans too. Many are surface-level fans who jumped on at various points from 1984 on. They’re there for the party. They’re vapid and their knowledge of anything is inch-deep. Then there’s the rural Cubs fans around the Midwest, primarily in Indiana, Iowa and downstate Illinois. They’re different, and generally less aggressive, than Cubs fans from Chicagoland itself. Those rural fans are also the backbone of the Cubs-Cardinals rivalry, because they’re on the front lines of it. Seething St. Louis hate doesn’t exist in Chicago anywhere near like it does for Milwaukee and Wisconsin. Chicago plays St. Louis in baseball and hockey. Chicago plays Wisconsin teams in everything but hockey. And for the last generation, Wisconsin teams, particularly the Packers, have had the upper hand, or at least, an even hand and that drives them crazy because they can’t exercise their superiority complex. So they grasp hard at any straw they feel gives them the upper hand, like the Cubs right now. Cubs fans from Chicagoland are no different than White Sox or Bears fans from Chicagoland. Outsize aggression because of deep-seated insecurity both about the quality of their city and their cities’ teams. And not only that? With a history of failure? They fear dropping back into the abyss they only recently emerged from. I tell my Cubs fans friends around here, all of whom fit into the “rural” Lower Midwest category, that watch out for a Cubs-Brewers playoff series, because it will be intense on a level they don’t understand. They say, “yeah right, Cubs-Cardinals is way bigger.” And historically? They’d be right, but I don’t think anyone outside of Chicago and Wisconsin, particularly SE Wisconsin, understands the level of enmity one region has for the other. We don’t like them and they repay in kind. A part of me would love it. A part of me hopes it never happens as it would be obnoxious beyond reason.