Young pulled up for a 3 early in the third quarter to make it 78-62, then stared at Dunn with his hands on his hips. That resulted in his second technical of the game and an ejection.
The two also had an exchange in the first quarter that resulted in both players getting technicals. There was some contact between the two after Young took a shot with play stopped following a timeout call. Dunn appeared to shove Young in the back of the head or neck before Bulls center Robin Lopez got between them.
Both players seemed surprised, with Young saying, "They made a call, I live with it. I looked at someone, and that was about it.''
Dunn told BullsTV that he disagreed with referee Mark Ayotte's decision to issue Young his second technical.
"I don't really know what happened, to be honest," Dunn said. "I just know that he got ejected, and I felt that he shouldn't have got ejected."
As Ayotte saw it, Young crossed a line.
"Taunting is directed at an opponent specifically,'' he told a pool reporter. "Celebration is not directed at an opponent.''
Hall of Famer Reggie Millerdisagreed, tweeting: "What's happened to my beloved NBA game? So damn SOFT and SENSITIVE now, nooooo way Trae Young should be given a technical for this.. I would have been broke and out of the league in 2 years. ... #LetBallersBall.''
Asked if Dunn's reaction on the first technical caught him by surprise, Young said: "Nah, I wasn't surprised. I don't know if he was mad about last game, but I wasn't surprised."
Young got the last laugh on Sunday, however, as the Hawks came away with a 123-118 victory. He had 18 points and five assists when he was tossed with 5:41 remaining in the third.
"I'm proud of my teammates, the way they played with everybody being out,'' Young said. "It's unbelievable. To get a win on the road is tough.''
Information from The Associated Press was used in this report.
Young starts hot before being ejected for taunting Dunn
Trae Young scored 18 points before getting ejected for taunting Kris Dunn after the two players jarred with each other earlier in the game.