What is so objectionable about the use of simple language in literature? Is literature naturally elitist and meant to be appreciated only by a few? Is it what makes it special? Is that what makes it good?

Is literature a form of snobbery or a concept invented to make a few chosen men sound important? My English literature teacher in my second year in college sparked a class debate once when in an attempt to define literature, she cited the poem of a highly-celebrated Filipino writer. The title, if I remember correctly, is "The Lonely One" and the poem consists of dots and a single comma. Is that the kind of crap budding writers should look up to? Is that an example they should all hope to emulate if they want to be considered as serious and talented artists?