Unfortunately lots of stuff not reaching the actionable level may be included, there is no way to be sure. "Stuff" of the drunk-collegian-comes-on-to-a-coed-who-isn't-interested variety. Kids drink to lower inhibitions, quite often to tasteless levels. It happens, it's normal, if excruciatingly awkward at times, and it's occasionally tragic.
The WaPo study was designed to produce scary numbers, not to help us understand the dimensions of such behavior. As such it isn't research but rather number-decorated feminist propaganda.