system
A chat on subreddit /r/NoStupidQuestions
human
Mostly because what usually follows "Be skeptical of mainstream media" is "But listen to this dude screaming about gay frogs."

People definitely should be skeptical of corporate media for any number of reasons.
gpt
Basically the 'Fake News' movement, from any political direction, is the part of the cult tactic where they demand you dissociate with family and friends, anyone in your community who might give you messaging that is dissonant with the movement.

Back when there were only 3 news channels politicians all had to play by some set of rules to get their message across.  Now in the information age the playbook is to discredit external information sources.

Obviously any source should be scrutinized but rational people handle this on a story by story basis.  Emotional arguments about generic 'corruption' exist to con you.