In ethical discussion, it is sometimes used to summarize a moral economy wherein privilege must be balanced by duty towards those who lack such privilege or who cannot perform such duty. It has been used recently primarily to refer to public responsibilities of the rich, famous and powerful, notably to provide good examples of behavior or to exceed minimal standards of decency.While there is little about hierarchy I admire, the movement from status to contract being the characteristic of progress, let alone progressive societies, the notion of Noblesse Oblige is something I do agree with.
I'm not from the "rights imply responsibility" school, if rights imply anything, they are not rights, they are rewards for good behaviour. The judgement of "good" is usually left to some external entity that will often judge according to its own self-interest.
Privilege on the other hand is different, this is a state above rights that individuals attain, or are assigned, and consequently I think they do impose an obligation to aid rather than capitalise on the advantage privilege confers.
Privilege arises in all kinds of ways, intelligence, health, wealth, good education, good parents, good looks, skills, strengths, in fact I guess most of us are privileged in one way or another. Some people find the concept that they are privleged so painful that they invoke all kinds of reasons why they should be the beneficiaries of noblesse oblige rather than executors of it.
Others take their privilege and use it to leverage themselves into some kind of moral high ground from where the hoi polloi can be despised for lacking what they are fortunate to possess. And please don't think the "self-made" are excused from this, the privilege of self-discipline is just another example.
There was in my past a self-made man who did nothing but pillory those who had not shown his fortitude. Gah, if they had, if many had, how smug, self-satisfied and righteous could that individual feel?
Climbing to a state of self-satisfaction over the limitations of your fellow human beings does seem an unpleasant way to live, IMVHO.