I too was at that game at Lambeau. I went with my Packer buddy. I was treated like a football fan, nothing more, nothing less. It was a great experience, but would have been better if KGB didn't sack Bledsoe everytime he went back to pass.
It was allot of fun.
I went to a preseason game in Irving Texas as well. That was a while back. They are a very quiet crowd, and some people were jerks but most ignored me.
Lastly, I went to a sunday night game against the Cards here in AZ. I can't comment on the Cardinal fans because I did not encounter any.