Hubristic

Everyone who has experienced the hubristic qualities of the Tufted race, and its satellites, will cordially sympathize with this sentiment of an orderly and industrious undergraduate [i.e. William Ewart Gladstone].

Aristotle […] also maintains that the wealth, strength, many friends, and power of the wealthy make them hubristic because they do not fear repercussions for their conduct. The wealthy are hubristic, he adds later[…], but the new rich are particularly so, and in their unrestrained state are likely to assault others and engage in sexual predation (i.e., as ways of asserting the status they want to be recognized as having).

[Elon] Musk is easily cast as a hubristic supervillain, lumped in with the tech bros and space playboys, for whom money is scorekeeping and rockets are the ultimate toy. But he's different: he's a manufacturing magnate—moving metal, not bytes.