The political norm prior to Trump has been to lie in more subtle ways such as lying by omissions or misrepresenting thing. There's been this notion that there should be some plausible deniability of the lie if it is ever called out. Trump showed that it doesn't actually matter whether the lie is blatant or not. Turns out that what matters to people is hearing a narrative that resonates with them.

I think that another interesting outcome from this was that it helped erode faith in the establishment. People in the mainstream would point to official and credible sources as proof of incorrect claims expecting that this would convince people that Trump's statements were lies. However, what actually happened was that people started getting increasingly angry at the mainstream sources and stopped believing in their validity.