I think teams are pushing their luck with the replacement refs. No they aren't as good as the normal ones, but they're doing the best they can. Screaming, swearing, pushing them etc... does nothing to make their jobs easier, and make them more accurate.
Team and players need to be held accountable as well. If I was the Commish, I'd be sending out a league wide warning, letting teams know that fines will be coming down if anyone is behaving in a manner that is detrimental to the ability of these refs to do their job as best as they can. John Fox definitely took liberties at embellishing, and overacting. Deplorable, and classless. There are methods and avenues to protest. Instead he should've more pissed off with his teams disgusting first half performance.
I felt sorry for those refs. They are PEOPLE, and everyone is treating them like a commodity. It doesn't help when the people who have no respect, treat you with no respect. How can any official in any game maintain order with teams taking the liberty of cheap shots.
The NFL needs to reel everyone in.