aesthete (n.) Look up aesthete at Dictionary.com
attested from 1878, in vogue 1881, from Greek aisthetes "one who perceives," from stem of aisthanesthai "to perceive (by the senses or by the mind), to feel," from PIE *awis-dh-yo-, from root *au- "to perceive" (see audience). Or perhaps from aesthetic on the model of athlete/athletic.
1. Properly, one who cultivates the sense of the beautiful; one in whom the artistic sense or faculty is highly developed; one very sensible of the beauties of nature or art.--2. Commonly, a person who affects great love of art, music, poetry, and the like, and corresponding indifference to practical matters; one who carries the cultivation of subordinate forms of the beautiful to an exaggerated extent: used in slight contempt. [Century Dictionary, 1897]

I want to be an aesthete,
And with the aesthetes stand;
A sunflower on my forehead,
And a lily in my hand.
["Puck," Oct. 5, 1881]
The idea is somewhat older than the word. Aesthetician "professor of taste" is from 1829; aestheticist is from 1868.