Regarding all the talk about ridicule, it was intended as a rebuttal to the idea that humor at someone's expense is _never_ appropriate. It is appropriate and even healthy for a society to be composed of individuals who can withstand a bit of a ribbing when they unwittingly find themselves representing human folly in one of its many forms, and who can stop and ask, why did that happen?, and potentially learn from it, if it came from a moment of lacking self-awareness, or if it was just bad luck (everyone - everyone - winds up in the crosshairs sometimes.)
Truly no ill will meant, just wanted to defend the social function of ridicule. It probably ended up being a lot more of a well, actually thing than I intended. Which I do get teased for sometimes.
(Also, following through on this, if such a solution - computers planning your lessons for you, so all you have to do is what the smart computer tells you to - were to become reality, the lack of teacher appreciation / salary, which was the main point of the parent comment, would not improve at all - it would likely get worse, with teachers getting paid less for fewer available jobs. The deskilling of labor would probably follow, reducing teacher roles to individual, specialized, repetitive tasks, since it saves an enormous amount of money if low-skilled workers can simply be swapped out if they don't work out.)
As you admit, the question asker might very well have been genuinely curious. The answer to their question doesn't seem blindingly obvious to me (although I can certainly speculate about good reasons that grading isn't automated). I can't tell what you mean by "unacceptable" (perhaps there is some cultural taboo you're referring to here?). And it also doesn't seem "dangerously naive", which might apply where someone asking this question had decision making power in a critical situation, but clearly doesn't apply here.
By the very criteria you lay out, this doesn't seem like an instance in which ridicule was necessary or good. To me, it feels like a weak justification for bullying someone who thinks differently about something you obviously feel very strongly about.