"Who you gonna believe, me or your lying eyes?"
It's been this way for a while, though. It's just that the stakes of the things they are willing to tell folks to "2+2=5" about seem to have dropped substantially. It used to be about the goodness of US foreign interventions and, say, "imperial capitalism" in general, and they made plenty of fun propaganda to support it: "Red Dawn" or "First Blood"- quality and fun propaganda.
When they started kidnapping folks from our communities who've been peacefully chilling and being community members for decades, it got a lot less abstract, I think.
If it helps, understand that it becomes ever easier to get folks to disbelieve the government when they can see it; it's far harder to get the average brunch-enjoyer to care when they are doing a central american coup... much easier to care when they are shooting yt wmn in the streets.
Famously, there are plenty of stories in the west about eastern-bloc countries and propaganda, where everyone knows that that the papers don't tell the truth but the truth circulates regardless.
So maybe don't worry about the false narratives- worry about the recouperative powers of capital to pull all those radicalized liberals back into the fold instead of using a mass line of organization to force structural changes.