'Post-truth' is the 2016 word of the year. It describes debate based on passion and emotion rather than reason and evidence. It's being critical without critical thinking skills. In short, it is active misinformation and the mainstay of fake news.
Time was that we referred to these people as either intellectual idiots or much worse. But, we wouldn't want to hurt anyone's feelings in this day and age of 'safe spaces' now would we. And I suppose that post-truther is a more precise and gentile way of describing someone who's a huckster, shill, film-flam man, etcetera.
So, google 'post truth' and you'll hit a treasure trove of well written articles.
Being critical versus critical thinking:
Wikipedia' entry on post-truth:
Fake News?! Comic