> with men bent on signaling their expertise all the goddamn time.

The Germans have a good name for them that many languages have incorporated: Besserwisser.

My way of treating them: let them talk. It makes them happy. I might even learn something new. If they are wrong, I do try to ask them a though provoking question. I know that the question will live in their head in the background for a long time. Perhaps one day it'll help change their minds.