Washington, DC and New York City based mainstream publications and websites are the real fountains of fake news in our society.
Since McCarthy lists are now back in vogue, I will contribute my own list of publications and websites you should avoid in order to prevent terminal brain-rot:
The Washington Post
The New York Times
The New Yorker
The Huffington Post
The Daily Beast
There are more, but this list is only for the most egregious offenders.
And apologies for the dickered link up above, it has been fixed.