It's just an immature crowd, then - I'm sure like every fanbase though there were rotten eggs and bunches of saints. I feel Nebraska may have had a worse experience than they ever will in Madison mostly because of the game being our first Big 10 experience... hell, I sort of see this game as becoming a rivalry between Wiscy and Nebraska. So long the fans there keep to being mostly sane towards our fans, I think there won't be a problem even if we get some stories of a drunken asshat <insert stupidness here> towards a Nebraska fan.
One thing that caught me by surprise however - The chanting overall from the Wiscy fans. It was part entertaining and cool, yet part... annoying. Good fun it seemed nonetheless.
