All the Trump supporters I know seem far more knowledgeable than the Trump opponents, and the opponents have all sorts of silly beliefs of their own.
(This is almost certainly due to selection bias - Trump hatred is a socially required belief in my circles, while Trump support is a very unusual position adopted only after careful thought and kept carefully hidden.)
There are many silly beliefs that Trump opponents have picked up from the mainstream media. For instance, compare beliefs about Trump-inspired crime to reality - most are hoaxes perpetrated by Trump opponents, and the most serious incidents (e.g. the kidnapping/torture of a mental retard) were committed by Trump opponents.
Or beliefs that Bannon and Trump are somehow antisemitic Nazis. Never mind that Trump was mentored by (((Roy Cohn))) and that the key people in his organization are (((Allen Weisenberg))), (((Michael Cohen))) and (((Jason Greenblatt))). Somehow (((Jared Kushner))) and (((Ivanka Trump))) are also involved. Not to mention that Bannon's rise to power came from working with (((Andrew Breitbart))), and he's secretly communicating with (((Curtis Yarvin))). [1]
Strangely, these crazy beliefs are never cited when discussing fake news. They just aren't part of the narrative. That's why I characterize this "fake news" push as propaganda - it's only about keeping non-mainstream sources out of the narrative.
[1] I'm only using the alt-right ((())) to emphasize what actual anti-semitic people would think of Trump.