Propaganda probably still works even if you're aware what's going on.
Pictures, voices, narratives, emotions directly create memories; connections between neurons are created or strenghtened - you can switch on your "anti virus" but the machine is hacked on the "hardware" level.
But it also helps a lot to periodically read how yet another US teacher is living in their car. After a while it becomes an instinct NOT to believe the propaganda that tells you otherwise.