I literally stated what Conservative Propaganda did in the quote.
The only thing Gingrich, Fox News, and TheInternet™ did was provide
disparate Conservatives a safespace to come together to form an Ur-Conservative group that exists today as the Modern Republican Party.
Disparate. Key word in that quote. I chose the word specifically.
Small-c conservative groups had all sorts of identifying features that set them apart from other conservative groups. Just a few kinds of independent groups that hadn't really been forged in
Liberal hate: Christian Fundamentalists (Evangelicals), White Supremacists, Anti-Semites, Anti-Abortion zealots, classical Fascists, Libertarians™, War Hawks/Jingoists, etc. They all knew who to vote for, but there wasn't constant, daily/hourly/by-the-minute talking points they could all adopt and use to be a monolithic, lock-step in-group of voters.
Gingrich, Fox News, and TheInternet™ provided them with key talking points. You say Fox News, but I'd say Gingrich was the Founding Father of the Ur-Conservative movement. His GoPAC memo from 1990 specifically. I've posted this before.
Language: A Key Mechanism of Control.
This was sent by Gingrich to House Republicans. After this, they all adopted the same language to demonize their political opponents. By demonizing Democrats and liberals, they became a very large in-group (and as you may have suspected, that group isn't holding together because they are self-purging, i.e. RINO classification for anyone who doesn't repeat, lockstep, the talking points they're all trained to repeat).
Here's the memo:
https://uh.edu/~englin/rephandout.html
Here's a 1995 article about it, that came out
over a year before Fox News.
https://fair.org/home/language-a-key-mechanism-of-control/
I'm not trying to say one thing is more important than another, but the right-wing authoritarianism we're dealing with is a top-down hierarchy. Republicans used it to take back the House in '94 and they've been using it since. Fox News and TheInternet™ are just the means by which the official in-group talking points are repeated for right-wing authoritarians to hear and then repeat as good in-group members.
I don't think we disagree on anything substantive here.
I believe that hatred hasn't gotten "worse". Trump, as President, has given right-wing authoritarians the "courage" to say what they've always believed, out loud and proud. The Republican base voter of 2016 was the same Republican base voter of 2012, 2008, 2004, 2000. Trump didn't whisper and dog whistle inherent Republican beliefs. He fucking bullhorned them every chance he got.