aristocratic, elitist, high-hat, persnickety, potty, snobbish, snobby, snooty, snotty, toffee-nosed(chiefly British)

aloof, arrogant, bumptious, haughty, high-and-mighty, highfalutin(also hifalutin), high-handed, hoity-toity, huffish, huffy, imperious, lordly, overweening, peremptory, pompous, presumptuous, pretentious, supercilious, superior, toplofty(also toploftical), uppitybiggety(or biggity, Southern & Midland), bigheaded, egoistic(also egoistical), egotistic(or egotistical), prideful, self-conceited, self-important, self-satisfied, smug, stuck-up, swelled-headed, swellheaded