a person who imitates, cultivates, or slavishly admires social superiors and is condescending or overbearing to others.

a person who believes himself or herself an expert or connoisseur in a given field and is condescending toward or disdainful of those who hold other opinions or have different tastes regarding this field

a musical snob.

noun

braggart , highbrow , name-dropper , parvenu , pretender , smarty pants , stiff neck , upstart , elitist , arriviste , knobstick , nouveau riche , pedant , rat , toady