Since she entered the scene, Addison Rae has consistently been a savvy pop girl, knowing exactly the right buttons to press to get gay men in clubs across the land to say, “Honestly, she did slay.” She recorded a famously leaked Lady Gaga demo on her debut EP, she hangs out with Charli XCX, and now she’s flipped Coke summer on its head. Yes, that’s right — between Charli’s “365” and Marcus Jordan, Ms. Rae is here to ask, “Is Pepsi okay?” Why yes! “Diet Pepsi,” her major label debut for Columbia Records...