Beneath a few layers of culture it seems the internal values of the two countries are very similar and fairly compatible.
Maybe that breeds contempt but seems like there is plenty of room for the two countries to play together nicely especially if they make progress on their faults. In spite of the online acrimony, each side seems to understand well enough its own and the other's faults, and they generally seem to be trying to work on their own faults as much as working on each others'.
This seems like a relationship that may come to blows but should be salvageable, especially if the blows can be softened or avoided perhaps altogether.