Dumusois called Kyrgios out for lackluster play at one point, saying his efforts were "really borderline" during the second set. Klahn beat the mercurial Aussie Nick Kyrgios for a similar 46 64 63 win, in just 78 minutes. "You have no right to tell me that it's poor".
"We don't really know and I don't think he really knows exactly what his potential is".
Later, after belting down an ace, Kyrgios sarcastically asked Dumusois: "Was that borderline?"
The 23-year-old rattled off another three aces to close out the game, pointing at the official each time.
Later Kyrgios said to Dumusois: "You know I literally could just go to the ATP office after this and say I felt put down from your comment and you'd be in trouble, right?" The 38th-ranked Kyrgios was on the end of a surprise first-round loss to the American qualifier Bradley Klahn, the world number 104 winning 4-6, 6-4, 6-3.
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Previous year in Shanghai, having received a warning for smashing two balls out of court in frustration, Kyrgios marched off midway through his first-round match against Steve Johnson.
Roger Federer believes that if Nick Kyrgios does not start sorting his act out, the talented Australian will not live up to his considerable potential.
As Klahn accepted the plaudits from the crowd, Kyrgios left the court using his mobile phone.
In 2016, he copped a $16,500 fine following a straight sets to Germany's Mischa Zverev.
Kyrgios has a chequered history at the Shanghai Masters after quitting mid-match against Steve Johnson in the first round a year ago and being accused of tanking in a second-round loss to Mischa Zverev in 2016. Swedish umpire Mohamed Lahyani was reprimanded by US Open organisers for going "beyond protocol" when he climbed down from his chair to give Nick Kyrgios a mid-match pep talk during his second round match against Pierre-Hugues Herbert.
Deposed this week as Australian No 1 by Alex de Minaur, Kyrgios argued with umpire Damien Dumusois after the Frenchman questioned Kyrgios' effort.