Nietzsche, painted a vivid image of ressentiment that is applicable in modern times:

They monopolize virtue, these weak, hopelessly sick people, there is no doubt of it: “We alone are the good and just,” they say, “we alone are homines bonae voluntatis.*” They walk among us as embodied reproaches, as warnings to us–as if health, well-constitutedness, strength, pride, and the sense of power were in themselves necessarily vicious things for which one must pay some day, and pay bitterly: how ready they themselves are at bottom to make one pay; how they crave to be hangmen. There is among them an abundance of the vengeful disguised as judges, who constantly bear the word “justice” in their mouths like poisonous spittle, always with pursed lips, always ready to spit upon all who are not discontented but go their way in good spirits. Nor is there lacking among them that most disgusting species of the vain, the mendacious failures whose aim is to appear as ” beautiful souls” and who bring to market their deformed sensuality, wrapped up in verses and other swaddling clothes, as “purity of heart”: the species of moral masturbators and “self-gratifiers.” The will of the weak to represent some form of superiority, their instinct for devious paths to tyranny over the healthy–where can it not be discovered, this will to power of the weakest!

–Genealogy of Morals, Third Essay, Section 15 (1887)
Translation by Walter Kaufmann (1967)

*Men of good will