I went to the NFC title game in Dallas in i believe 1995.
I gave the Cowboys fans some crap before the game, but did it in fun, and they in turn treated me the same.
One group had some Packer pictures and pennants on the ground for Cowboy fans to step on, and i got down and pretended to kiss the pennants.
That got a howl out of them, and it was all cool.
I think alot of it has to do with how you react in "hostile" teritory.
If you come across too strong, trouble will find you.
But i haven't been to a game at Miin or Chicago, so i don't really know what it's like there.