I don't see any new loathing revealed here, because the participants' private attitudes appear to be consistent with their public statements. Did the people who are surprised by this think that the public hostility was just an act?
(On the contrary, I think this was a relatively reasonable discussion aside from some gratuitous insults. Isolationism is a normal ideology compared to, say, trying to annex Canada.)
I'm not saying it isn't valuable - only that it isn't surprising. With that said, leaking a private discussion which just coincidentally shows they're not bluffing is awfully convenient...