I had my reservations about the apparent spontaneity of this scenario at Kourtney's after years of being acclimated to the far more staged world of Keeping Up with the Kardashians, in which it appeared that every scene was laid out on a call sheet weeks in advance.
Kourtney, on the other hand, seemed to be completely uninterested in the dialogue. Regardless, they try to bring her down from wherever planet her Blink-182 spaceship landed on and have her hash this out with Scott so that they don't get caught in the crossfire.