I have absolutely no problem with the Vikings running up the score on the Cowboys. Even though the Vikings are my favorite NFL team, I still wouldn't have a problem with somebody running up the score on them.
It's professional football. Feelings are left in the locker room. You come to play, make money, and win a Superbowl. You don't show up to care about how another team will feel when you blow them out by 31 points.
Does anybody really think Jerry Jones would have felt "sorry" for the Vikings if the Cowboys are the ones who ran up the score? The Cowboys are arguably the most arrogant football team in the nation, right up there with the Patriots. They would have had no problem running up the score on anybody else, but when it happens to them it's "classless".
Gimme a break, Cowboys. Just because you have tanked your playoff chances for the last decade and a half doesn't mean you have the right to call out another team.
You want the beat down on your team to stop? Do something about it.