People are going overboard criticizing the bubble quiz. As a research tool, it wasn't really intended to be a useful interpreted on an individual level. The point was to find some measure that would distinguish the social isolation by zip code. Of note, even the lowest income/education zip codes had scores averaging in the 40s. It wasn't until you got really up there that there was a sharp decline into lower scores.
Point taken but then my feedback would shift to why the quiz only seems to be inquiring about those in an "elite left wing bubble" from the blue collar midwest type folks. The later are in just as much of their own bubble to the experiences and concerns of a coastal urban progressive type. Questions like "have you ever walked on a factory floor" or "do you know who this (insert NASCAR driver name here)" should be equally matched by questions seeking opposite type "bubble" mentality. Stuff like:
1. Are you personal friends with people who are first generation immigrants from more than one country (and not the one you're from originally)?
2. Have you ever been stopped by police mostly because of your skin color or similar characteristic?
3. Can you name the major precepts of the major religious groups beside the one to which you belong?
4. Have you ever represented the "management" side of an employment relationship and do things like make payroll, handle employee complaints, lay off a worker due to a business downturn, etc?
5. Have you ever lived/worked in or next to an urban area with high rates of crime, violence, drug use, and poverty?