I don't think the Packers fan was mad because the guy had the Vikings thing in his yard he was mad because his sister broke up with him and he was out of moonshine!
This happened about 6 blocks from my office. The interesting thing is the local high school teams mascot is the Vikings. It is a hard town to work in. They even copy the MN Vikings and play a crazy horn over the loud speakers at the local high school game like at the Viking stadium.
The guy that cut the Viking fan up didnt realize this guy was just a fan of the local high school team.