Being called a dog by Ning Fan was not taken lightly by Shangguan Tanglong, who was of advanced years. Even though members of the Yunteng Family might think the same, they would never say it out loud easily because once said, it would truly mean tearing off all pretenses of civility. They still cared about the Shangguan Family's feelings to some extent.
As for Ning Fan, he didn't need to care about the feelings of the Shangguan Family. He spoke his mind freely, and though he seemed unrestrained and arrogant, this was nothing less than what the Shangguan Family deserved.