Much of this is because US politicians, pundits, and journalists use “class” in a distorted way, especially “middle class”, which they use to mean “middle income”, and “middle income” generally is defined to include people who are working full time, but are below the poverty line. This is effectively meaningless as a term of analysis, but more importantly, this usage displaces the usage of class as an analytic tool for modeling social structure. I suspect, somewhere along the line, this usage was introduced deliberately to induce this sort of confusion.
I try to remember to point out I’m using “class” in the Marxist sense (which is kind of like having to say “I’m using ‘theory’ in the science sense”, in a discussion of evolution) but for that to help, you have to understand a) what the Marxist sense of “class” is, and b) that the way journalists, etc., use the term is an incompatible usage.
Describing a person’s class position is not a moral judgment of that person. Nor is saying that a person is privileged. Saying that someone is middle class doesn’t even mean that things are going great for them. As I was saying, we’re in a crisis in which the middle class – in the Marxist sense! – is really under a lot of pressure. This was why the “99%” slogan was a good one: it’s genuinely the case that over the last few decades, conditions have worsened overall for everyone but the ruling class.
What I’m critical of was the political strategy implicit in insisting too strongly on the “99%” slogan. A core Marxist idea was that an extraordinary thing about the working class is that struggling for socialism is in its direct material interests – whereas it isn’t in the direct interests of the middle class, though it is in the indirect interests of everyone. The trouble is that since the role of middle class people is to act as intermediaries, they tend to interpose themselves as leaders in any social movement – but their material interests tend to lead them to favoring stability, over radical change.
It is important to note that people don’t always act according to their immediate material interests, and that material interests are complex and often contradictory, more so for individuals. To some extent, to talk about class in the context of political strategy is to talk about statistical abstractions. Individuals of any class would be welcome in a working class movement, so long as they accept and support working class leadership – and many middle class people do, as individuals.