I think inverted snobbery is so ingrained in middle class life that it is sometimes hard to see where it begins, and snobbery ends!
I don't know, I think there are lots of variations to ordinary snobbery.
There's moral superiority snobbery, which covers a lot of territory that could also be inverted snobbery. (Your fat car not only makes you look wealthy, it is also bad for the planet)
There is intellectual superiority snobbery, which can overlap with ordinary snobbery, but there are subtle differences. The intellectual snob will feel superior for watching operas instead of Big Brother, but to the intellectual snob, it does not matter that she watches/hears the opera on DVD, while the ordinary snob will make sure to have the best kind of seat available to watch the actual performance.
And of course, a big TV screen is something the ordinary snob wants to have, but the intellectual snob might be proud of not having any TV at all.
I think most middle class things are not actually inverted snobbery, but just other kinds of snobbery.