Sounds about right, until the reality check. How often do you raise the problem of the incommunicability of qualia outside hacker news? With what purpose? How often does that conversation accomplish its purpose?
You know, I've always figured, if our culture was based on an epistemic fundament that acknowledged and properly accounted for the fundamental incommunicability of percepts, it probably would've been a better world. (One where it's much easier for everyone to communicate accurately and effectively; as people would not expect of themselves and of each other to be "objective", just verbalize their current understandings as best as they could, without stressing too much over how understanding can only ever be subjective and incomplete.)
Some of us do envision such a world, but instead find ourselves living in a planetary culture based on the very rejection of the exact distinction that you're trying to point out. Turns out Cartesian dualism offers a lot of leeway along the "is-ought" axis, huh. (Qui bono, et sapienti sat.)
Enough to make the generally accepted standard for "objectively right" to be "the house is always right". (Supposedly, a supermajority of objects does not a subject make - or vice versa. And yet post-Enlightenment history is rife with efforts to scientifically desubjectify subjects in the service of some objectively rational philosopher king.)
And yet it seems to work well enough for most prosocials, you don't see them complaining, now do they? (What's a little mass neurosis between civilized folk?) I think it's safe to say that a member of the general public is cognizant of the labels they've been accultured to, at least to the same extent as they're aware of the physical reality which surrounds them. (If not vastly more so, physical reality being the more predictable of the two.)
This would mean that they have not actually experienced the quale of "incommunicable, inaccessible between humans [qualia]" and therefore the distinction you're trying to point out here is not in fact something they are able to think about; only perhaps to construct sentences about it by example, much like a LLM or a(n M)BA does.
As I'm sure you already know your own subjective version of most of the above, but I'm guessing you maybe view it more like a problematic to be struggled with, rather than a natural paradox and absurdity deserving of a more playful approach, I'd totally leave the celestial color coordination (along with all the worrying about whether people get it) to you - you, personally, and certainly none of the other folks. Not in the least because agreeing with people on how colors are called does not seem to be inherently conducive to being able to fly.