According to Wei Song, Gu Lun became enemies with King Rizhu of Norland very easily.
At that time, the Seventh Prince, who acted as a hostage, was not supported by all the parties of the Imperial Court in the Central Plain. He seemed not to be very king-like. He was like a small beast who was not loved and was forced to leave his mother. Naturally, he would not be welcomed by other beasts.
They had the argument at the wine table. The son of King Rizhu regarded the Prince as a noble of a small country in the Western Region, who had asked for asylum while behaving rudely. On top of that, he had instigated trouble while pouring wine into his guest's mouth.
If he had done the same thing towards the Norland people, those people would have been friendly. But for the Seventh Prince who grew up in the palace, it was an unprecedented insult.