Every league is protective of its officiating, and understandably so, because accuracy of officiating is fundamental to the sense of the integrity of the game, and thus its credibility and legitimacy. A league defending its own calls, of course, isn’t going to get everybody to agree with the decisions that they make, whether that’s fans, players, or even coaches (as Mike Tomlin disagreed with a flag thrown on Ray-Ray McCloud last year, and on Trai Turner being ejected).
But it’s most often the players themselves who grow frustrated by officiating decisions, and in recent years, among the most scrutinized calls have been roughing the passer penalties.