It's a bit old fashioned to say that class is a left wing obsession, too. It is talked about, for sure, by, ahem, older lefties, but it is a dying topic. But I think that is a bit of a shame, because it is a factor, albeit an almost taboo factor. In my younger days in particular I had a wide circle of buddies, and when the chips (or fries) were down they all reverted to "type". A bit of a social faux pas was ignored in the group but a great source of amusement once the poor old middle classer had left the building. Nothing has changed as far as I can see in my still reasonably eclectic circles. And that is neither good nor bad - just a fact of life. We bond and group and create bands to which we want to belong. It's a society thing!! I guess I am just lucky in that I can get along with most people and don't personally care!!
