The poor are from Earth; the born rich are from Jupiter

     Once upon a time (now over 25 years ago), John Gray wrote a book called "Men are from Mars, Women are from Venus". The primary precept was that most men have very different communication styles, history/usage of words, emotional needs, and modes of behavior from that of most women. Of course, the book was only an abridged version -- the full explanation of such is actually a multi-volume series that competes in length with, or exceeds, a set of the old Encyclopedia Britannica and goes out-of-date within weeks.
     Similar to George Washington's "cherry tree", it is highly unlikely that Marie Antoinette ever said "let them eat cake". But the concept that people might not have enough to eat was incomprehensible to her. Food had always just appeared (it was never visibly raised, purchased, transported, or prepared) for her. From the viewpoint of the poor, they felt they were being mocked and could not conceive of anyone being unaware of the pain, and work, needed for daily survival.
     Such a clash brought about the French Revolution and earnest use of the guillotine. The disjoint environments of the lowest class from the higher classes in Russia brought about the Bolshevik Revolution (followed by the Communist Revolution). In the United States, being a division of income rather than social class, it brought about the Great Depression.
     In an explicit class system (such as Britain, or India, or many other areas) each social class is clearly trained in expectation of their eventual roles. Certain language, and usage, is taught from an early age. Clothing has its clear do's and don'ts and has its own (usually unwritten -- but passed along from generation to generation) appropriateness depending on the situation. Most important, accepted behavior within the social class, as well as accepted behavior between levels of the social classes, are firmly indoctrinated. These social class behaviors and expectations are not directly associated with wealth but the lack of sufficient money can sometimes cause situations where it is difficult to properly meet the expectations of the social class.
     Movement between social class levels is very difficult. There is certainly a lot of explicit exclusion ("you cannot interact with them") but much of it is a severe discomfort which results from not having been raised from birth into the sub-societal expectations. Always a "fish out of water" and never fully accepted.
     In the case of income classes, movement is possible -- although presently becoming more and more difficult. Once again, however, if a person has never been an active part of an income class, it is a different world for them. We have heard millionaire politicians make statements very parallel to the mythical "let them eat cake" (in particular, not knowing how much a gallon of milk costs, the cost of rent in a local city, or how living costs are paid).
     If you have never been involuntarily hungry and have never worried about whether there will be food to eat then it is not a concept that is easily understood. If health care has been always available and never questioned then the idea of others not having health care is not understood. In even more severe form, if one has never even wondered how they have food, clothing, vacations, houses, and so forth then the innate assumption is that is true for everyone. Not only is it difficult them to understand -- but many fall back into the false assumption that "it must be their fault".
     Note that people who HAVE moved between income classes ("rags to riches" or "lost everything") can have a direct understanding of those income classes that they have been an active part of. People BORN within an income class have to deliberately self-educate (being part of the Peace Corps for a couple of years might help a lot for the wealthy to have some relevant experience) to understand other income classes.
     In the case of democratically elected governmental representatives, it is important to bypass the advertising, and campaign snapshots, and remember that they are there to REPRESENT you -- born millionaires (or born billionaires) will be severely crippled in the ability to understand, and represent, the general non-wealthy masses. Allowing non-representative people to represent the voters is a CHOICE and must be remembered as such. If you want your representatives to represent you, then you must choose people who understand, and have experienced, the problems that they need to address.