Well, it can equally be said that the conservatives don't understand leftists. Further, the right is just as broken as the left, evidenced by the guy sitting in the WH. Trump seems to be one of the last gasps of Conservative ideology wish to retain power by any means that they can. I think it's folly, as conservatism should alway have a place, and thrive, but the Trump backlash may be the beginning of the end.
Conservatives and moderates could accurately predict how the left would answer questions on values. Progressives could not accurately predict how conservatives would answer the same questions. So no. It can’t be equally said.
I think the reason for that is progressives live in a bigger ideological bubble. For example, Hollywood and the media are predominately left. Hollywood portrays the right as uneducated, heartless idiots. Nearly everyone in journalism is on the left to far left. Many lefty activists become journalists and they present the same inaccurate view of conservatives as the movies and TV.
Conservatives are much more exposed to the left because, if you don’t live in a bunker, you can’t help but be exposed to it. Of course the right and the left aren’t monoliths either. Not everyone on the left misunderstands conservatives. Not all conservatives understand progressives. But it’s skewed enough to say it’s nowhere near equal.
Trump isn’t evidence of a broken Right. He is a natural conclusion of the broken left. That’s not to say some people on the right aren’t broken. But the left is orders of magnitude more broken. If you don’t think so, perhaps you’re among the people who don’t understand the right.