Bull. Liberals and conservatives have always disagreed about which facts are more important and what to do about them. But this era is the first time in the history of the free world that a major political movement has declared their opinions to be equal to facts and reality itself to be subservient to their fantasies and fears. Never before has a leader of the free world declared that 1 million is more than 3 million. Never before has a majority of either side declared that gun deaths are more common in Europe than America and dismissed the facts that disprove that claim as fraudulent purely on the basis of conflict with their prejudice.
What's happening now has never in history ever happened before in free countries. This is the kind of lies that previously were impossible to spread outside of absolute, totalitarian states. 
This is a textbook example of something completely and utterly unprecedented. 

There is no equivalent anywhere. On the left or even the older right.