I imagine that these people, including Mr Schiff, are intelligent and hard working people. One typically doesn't accidentally run into a mid-six figure salary.
I have no idea why you make this assumption, or actually I do, but let's pretend I do not. It is not founded on any empirical investigations into the matter. It is founded on ideological propaganda, that the system 'works' in favor of those who are best at their fields and deserve it the most. However, research into the matter shows that the major contributing factors to wealth are completely arbitrary variables such as family, contacts and location, along with selfishness (valuing themselves over others). Note that 'work ethic', 'hard work', 'intelligence', 'expertise', 'determination' and so on are completely irrelevant in statistical terms. What were once considered honorable professions requiring unique talent acquired through years of practice are now relegated to the conveyor belts and assembly lines of countries where labor is cheapest.
No wonder you have the richest population of countries basically making huge fortunes off of the misery of other people (they have no qualms about not contributing anything to society but taking wealth that would make nations green with envy). They contribute nothing, their gains are privatized and their losses are socialized.
I'd love to see the American lower class who deny the relativity of suffering justify their hardships to people literally dying of starvation and dehydration. I can't imagine anyone with access to the internet and spare time to read and write a response to a Bloomberg article has any grounds for denying the truth of the relativity of suffering.
There is nothing about suffering in-and-of itself that is relative, however f.ex. the poverty lines of countries can be considered relative for many reasons (for example, social/cultural acceptance of poverty).
If we talk for example about marxists, if they are reasonably bright and non-dogmatic, they would not deny that members of the ruling class can suffer. The psychological or emotional state is irrelevant to their views. The classes are not defined by use of the words "suffering", "privilege" or similar, which are popular to use today. They are defined through their relationship with means of production, and perhaps more explicitly whether they rent out their own labor for survival, or whether they rent other's labor for profit. It is a generalized concept of society.