Der selbstgefälliger Fachidiot

The Besserwisser indeed lords over his campus fief captive audience, yet extrapolates his precociousness to global concerns with an air of fraught importance.
  In days of yore, he might dare write an op-ed in local media organs, risking criticism of his turgid bloviations. Today he plays it safe by sticking to 280-character social media posts where oleaginous persuasions are easily digested by puerile doddypolls who publicly regurge it all to impress the world with other people’s wisdumb.