So we write people off because they don't know leftist jargon, or would yawn at a dense old economics treatise? That's not a good plan.

The main, immediate challenge for the U.S. left right now is to figure out how to bring the great mass of the population that's dissatisfied with capitalism into some kind of organized leftist movement. That's going to involve communicating with people in terms they understand, at least at first. Saying that liberals are anti-vaxers makes no sense to any ordinary person. If we can't speak to ordinary people, that's an us problem.