Use Catchphrases
It's much easier to spread propaganda by using phrases that are catchy and memorable. Your base is more apt to spread or believe false information if you give them a simple catchphrase to use rather than arguments based in reason.The left uses catchphrases to promote true and rational causes. The right has an arsenal of catchphrases which are pure propaganda covering for their lies and extremism such as drain the swamp, fake news, deep state, lock her up, welfare queens and more....
Someone posts a true article critical of conservatives, their base can just reflexively dismiss it as "fake news" and not be exposed to uncomfortable truths.