I view it as a symptom of the broader effort to villify the fourth estate and condition people to act(vote) on their emotions rather than a rational look at verifiable facts.
The "Main Stream Media" rhetoric really started with the teaparty stuff, powered by the internet, and championed both the right (tea party in america, faragists in the UK) and left (corbynistas in the uk, AOC types I assume in the states)