Republicans are not as partisan by nature, and some will go out of their way to watch the opposition, either to cement their view of it or see if they are worthy. There is no such equivalent on the new left, liberals are mostly a monolithic group these days, if you have a liberal critical thinker who is active in knowledge gathering (head not in sand, willingly or otherwise), he or she is now a Republican, or an independent.
Being from the bubble previously, I can see how incredibly powerful propaganda and peer pressure is, not only to support your views but also to create a feeling of "otherness" by gaslighting, misrepresenting the opposition, it's an art form and the left has it down to a science.
There are many liberals, even active ones in the media, who will write articles about how the right wing is going too far right, or how the media is "right biased", or how the Republican Party has moved so far right it's not even reachable, it's absolute insanity to even read this but yet young liberals in cities believe all that, as if the world started spinning when they were born.