Trump tweets: The media is the 'enemy of the American people'

As someone who doesn't care about politics but is curious to why there's such dramatic reactions to nearly everything Trump says here on /politics (which shows up in my /all feed), can you explain in a non-dramatic way how Trump is 'declaring war on the First Amendment' by saying "fake news media" is an enemy of the American people? I see no declaration of war do you? Are you saying that calling out fake news sites can lead to calling out real news sites, which can then lead to x,y,z events occurring which will inevitably result in the abolishment of the first amendment?
As for the 'fake news' media, do you think that 'all' media is 100% credible with 100% neutral leanings as to never attempt to shape a story or narrative to sway people into adopting that position themselves? Do you think there's such a thing as 'fake media' that exists? Would you be allowed to call out said fake media as a threat to people who would heed its message and formulate their opinions based around that message? Is this all sensationalism? I'm genuinely curious what's going on here on /politics because there are constantly threads like this where posters (like yourself) make it seem like the sky is falling.

/r/politics Thread Parent Link - thehill.com