Mike Posner is at the head of a new genre: frat-house R&B. Posner, 22, released two mixtapes while he was a Sigma Nu brother at Duke, and on his major-label debut, he’s still at the kegger, beer goggles fogged up with resentments and grudges. In the smash single “Cooler Than Me,” he whines about a girl who won’t give him the time of day. In “Cheated,” he sings, “Nobody told me I was dating a whore.” Posner’s raspy croon is thin but insinuating; the production is serviceably swank, full of big, club-friendly synth hooks. But does anyone, frat boys included, really want to spend time with this guy?