Khan and Mister Cirvags had quite the public fallout after the news of the Thilku military planet was leaked, and the following fight against Brigadier General Meadrey had ultimately pushed the former to leave humankind.
Afterward, Khan had met the Thilku Emperor, returning to Baoway as a Thilku Lord. By then, he was already far beyond Mister Cirvags' authority, and the breakup with Monica had made him disregard that part of his life entirely, leaving everything in his uncle's hands.
Therefore, Khan and Mister Cirvags never had the chance to patch up their relationship. They didn't need to, either. At least, Khan could completely dismiss that matter since his version of politics existed in a realm the old soldier couldn't hope to reach.
Because of that, that unnecessary taunt had sounded genuinely petty, especially since Mister Cirvags couldn't possibly respond accordingly. Khan was the topmost authority at that massive gathering, and if he wanted to bully underlings, he would.