Rudeness and assaults on dignity of those in power has been a key aspect of protest art for centuries, but it's human nature to always imagine the moment we live in as worse than some vaunted golden age. 300-odd years ago a newspaper published a cartoon showing George Washington pulling a donkey. The caption implied that an ass was being led to the presidency. 
LBJ - a highly respected president, the man who made JFK's civil rights act a reality - was infamous for his obsession with his own penis. It was a common experience for anybody who entered the gents in the white house with him to have him flaunt it at them and say something like "Have you ever seen one this big" - a behaviour that, even then, would be flagrantly illegal if done to a woman, but in that homophobic era he got away with doing it to his male staff !

The prudish Victorians produced no end of pornography !  

There has never been an era of polite discourse in politics or art. And boundaries are always pushed.