If that's true, we're doomed.
A lot of this is a lack of truthful information and Fox News spin. They're just not being exposed to this reality, and they're taught to reject it the few times they brush against it. Yeah, it's dumb, but it's where we're at.
If it's forced in front of enough of them long enough, some number will see it. That's why when voting happens lately it's a 20 point swing towards Democrats.
The Mexican flags sure make it look a lot like Fox News's version of "invasion from Mexico" is a real thing. It helps to keep those people in their bubble.