They fall for it because they want to.
@realDonaldTrump has provided an "object of hate" for people who need to be "against" something or someone. They are, for the most part, intellectually lazy, and uninterested in doing their own thinking. They let the MSM think for them. https://twitter.com/ScottAdamsSays/status/1254024645486866432

They sure stopped this tweet dead in its tracks!