I think the idea was that while many college kids who were in the class first given these questions often came from the same socio-economical background, their parents did not make sure the all had the same privileges and experiences. Of course, with this meme going around LJ, I think it's taken way out of context, as many of us do not come from the same socio-economical background, thus totally losing the point of the questions in the first place.

Except -- speaking as someone who went to and works at a private university -- I really doubt that these kids did come from the same socio-economic background. The original page says it is aimed at residence hall staff; I think it is more likely intended to educate those staff about the various differences in experiences the students they're working with may have had.