Thanks to those of you who answered my question a few posts back on what to do about a teacher my son has been worrying over. I thought yesterday's report-card arrival might provide some impetus for setting up a meeting, but look at that, the little son-of-a-gun made it on the honor roll, the first quarter of high school. The teacher in question gave him a "B" and a "Satisfactory" for behavior, so yeah, I shall continue with the "well enough alone" course of (non)action.
My daughter made the honor roll, too, for the second time in her high-school career. Look at me, I've got a couple of overachievers all of a sudden.