Liberals may feel energized by a surge in political activism, and a unified stance against a president they see as irresponsible and even dangerous. But that momentum is provoking an equal and opposite reaction on the right. In recent interviews, conservative voters said they felt assaulted by what they said was a kind of moral Bolshevism — the belief that the liberal vision for the country was the only right one. Disagreeing meant being publicly shamed.

Protests and righteous indignation on social media and in Hollywood may seem to liberals to be about policy and persuasion. But moderate conservatives say they are having the opposite effect, chipping away at their middle ground and pushing them closer to Mr. Trump.

“The name calling from the left is crazy,” said Bryce Youngquist, 34, who works in sales for a tech start-up in Mountain View, Calif., a liberal enclave where admitting you voted for Mr. Trump is a little like saying in the 1950s that you were gay. “They are complaining that Trump calls people names, but they turned into some mean people.”…

Conservatives have gotten vicious, too, sometimes with Mr. Trump’s encouragement. But if political action is meant to persuade people that Mr. Trump is bad for the country, then people on the fence would seem a logical place to start. Yet many seemingly persuadable conservatives say that liberals are burning bridges rather than building them.