it's certainly incorrect to claim that no conclusions could be drawn from them even in principle.
I wouldn't claim that, my claim is that there can't be one formula specifying what you want to measure, so for reasonably similar societies like this one and that of fifty years ago, you can't draw conclusions like that. If one looks at all the equally (in)appropriate ways to measure what you're making claims about, the modern USA outperforms 18th century Russia in enough ways that we can draw conclusions. I'll elaborate a bit on your examples.
fuzzy observations
The observations are the least fuzzy part.
the fear and disgust of mere proximity to anyone below a certain class
With something like this, you could perhaps quantify fear disgust of millions of people if in proximity to other people. You might find that in one society, 50% are extremely disgusted by the bottom 5%, and nonplussed by the others, and the top 10% of that is disgusted by the whole bottom 50%, while in another society, the top 20% is moderately disgusted by the bottom 80%, and the top 40% absolutely repulsed by the bottom 1%...etc.
What exactly, or even approximately, are your criteria, and how much do you think others on this site share them?
What our society has is an unprecedented tabooing of many overt scorning behaviors and thoughts. Perhaps you totally discount that? It has also tamed superstition enough that there is no system of ritual purity. People at least believe they believe in meritocracy. There is a rare disregard of bloodlines and heredity, compared to other times and places, including modern Japan.
the media portrayals of people doing jobs at various percentiles of the income distribution
What that brings to mind for me is the honest labor memes from the Puritans, and how so many were ready to identify with the common man, Joe the plumber, etc. One might say that this was primarily or only because he is white, and I think we all discount its value because of that to some extent, and if you idiosyncratically discount it more than others, you should be upfront about that by being more specific, and not make implicit claims that according to your readers' values, what you say is true.
Were I trying to call out a certain statement as being sexist, I might quote the statement and tell people that the statement is sexist. That's totally legitimate if I think that, would they reflect rationally and calmly, they would come to the same conclusion, according to their values. But if the reason I think that the statement is sexist is because it's written in English, which has a long history of being used by sexists, it would be totally illegitimate for me to simply say to normal human beings that the statement is sexist, because the reason I think it sexist is its mere expression in English.
If you believe that your claims resonate with normal conceptions of fairness upon reflection by people, it's fine for you to just make them. But this particular claim of yours is so, let's say counter-intuitive, that I suspect you have very idiosyncratic values in which the worth of a great many things is reduced to zero where other people would think it worth something, perhaps a great deal. If so, please clarify that when you say "The better-off classes view those beneath them with frightful scorn and contempt, and the underclass has been dehumanized to a degree barely precedented in human history," you just don't mean "contempt" and "dehumanized" the way your readers do.
I think there may be some "rosy retrospection" going on here.
It seems like we have some essential misunderstandings on these points:
What our society has is an unprecedented tabooing of many overt scorning behaviors and thoughts. Perhaps you totally discount that? It has also tamed superstition enough that there is no system of ritual purity. People at least believe they believe in meritocracy. There is a rare disregard of bloodlines and heredity, compared to other times and places, including modern Japan.
The "status skew" I have in mind has nothing to do with the issues of fairness and meritocracy. In ...
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: