They should just be glad guns aren't allowed in. I have a feeling more than boos will be flying if they have a second half like the first half they just had.
In over a decade of Viking fandom, I think this is the first time I've ever heard them get booed at home. Vikings fans aren't known for turning on their own team (not like, say, Philly). It's the Minnesota hospitality thing... but I guess it's already been exhausted in a couple of hours