The only thing that matters is your relationship to the means of production: 'middle class' people are proletariat just like 'lower class' people are. It has absolutely nothing to do with your positioning in the table of income.
I understand what you mean. I can see how that relationship might be important to the theory. But what I said about "classes" (bad word: s/classes/quantiles/) is actually true. So if we're going to discuss whether, in fact, workers lost more wealth than capitalists (or, s/capitalists/correct terminology/), those empirical issues should still be addressed.
For example, I may be a "worker bee" consultant at IBM, but holding stock factually altered my exposure to wealth shocks.
You wouldn't even understand an answer I'd give you, because it'd be in Marxist terminology. Maybe Oscilliscope will be willing to explain their comment, I don't care to at this time.
Fair enough.