If people are going to disturb me at 2am in my hotel room, you better fucking believe I'm going to make lemonade out of those lemons and get some entertainment out of it.
And while I can't say if the boyfriend had also been drinking, I can say that he was calm and didn't sound drunk at all. The girl sounded completely smashed, despite protesting, "I'm not fucking drunk!" at one point, when he accused her of being drunk.
Also note that she didn't accuse him back of being drunk.
I'm assuming she probably hammered the alcohol really hard and became and angry drunk, whereas her man probably didn't drink or had relatively little.
I remember having a certain friend whose relationship/marriage featured that situation time and time again. Some of you might know him.