ARE YOU AN IDIYOUT? That's the question I had after experiencing my first Jason Mraz concert on Saturday night at the Orpheum Theatre. Beforehand, all I pretty much knew about Mraz was his "Remedy" song and his knack for witty wordplay. Turns out he's pretty good, although he seems to swing back and forth from the girly-girl songs of a John Mayer and the clever rapid-fire banter of a Barenaked Ladies. I enjoyed Jason's softer side. But his fans? Many seemed to belong to the breed I like to call the idiyout. Young and dumb. It's one thing to shriek at the sight of a singer. You're a superfan, you're entitled to such behavior. When you heckle your idol, however, you're not helping. They treated Raul Midon even worse, attempting to turn every one of his songs into a clap-a-long, hooting and hollering over the solo acoustic wonder. Ugh. Idiyouts, I say.