key's an irrelevant idol without the talent or looks or entertainment value to stand out in his group or among the other idols. he prides himself on his ~individuality partly because he can't get a strong idol persona in other ways. it's not that mature but there are worse things. flashy clothes are a better way to feel good about yourself than plastic surgery and he genuinely loves fashion. his tastes in culture are pretty mainstream and not elitist but i think he does feel superior about his way of thinking