It's scarier than that.
Trump's core supporters DO know that Bannon is a racist, alt-right bigot who despises any media organisation who dares to be centre or centre left.
Not only do they know, but they will applaud him for saying this. All this from a base who want to "protect" the constitution (Read: They want their guns), yet care little for freedom of the press.
This is advocating outright authoritarianism, and frankly, shouldn't be a shock to anyone. How the GOP can stand by such a person is beyond me. Power over ethics every bloody time.