I think they are just the vocal minority. I've been there, and seen a lot of Cubs fans in the stands, but it's still 5-3 Reds fans. They just like to talk trash and yell a lot. The Cincinnati crowds are more reserved. Hopefully those cheerleaders will fix that.
Championships for MY teams in my lifetime:
Cincinnati Reds - 75, 76, 90
Chicago Blackhawks - 10, 13
University of Kentucky - 78, 96, 98, 12
Cincinnati Bengals - None
Chicago Bulls - 91, 92, 93, 96, 97, 98