"I'm not gonna talk about that," Wallace told reporters after the Nets were defeated by the Celtics 93-76 at the Barclays Center.
With 9:31 left in the fourth and Boston leading Brooklyn by 17, Wallace grabbed an offensive rebound and went up for a putback. Wallace was fouled and got tangled up with Garnett as the two landed on the floor. Wallace appeared to grab Garnett's shorts or jersey to brace himself from falling and did not immediately let go.
Garnett took umbrage and swatted at Wallace's hand to separate himself. The two then engaged in a brief shoving match, with other players stepping into the fray, among them Nets center Andray Blatche and Celtics guard Courtney Lee, who exchanged words.
"I don't know where in America you can jack somebody's pants up or shorts up," Garnett told reporters. "I don't know, I don't know, I don't know what the hell was going on."
Double technical fouls were assessed to Wallace, Garnett, Blatche and Lee.
"It looked like to me somebody was grabbing his jersey, kept looking at him," Celtics coach Doc Rivers said. "The guy kept grabbing his jersey, and he wanted him not to grab his jersey anymore. It was much to do about nothing, honestly. The overreaction just drives me nuts. That's just the way it is. Nobody is going to do anything."
"I didn't get an explanation," Nets coach Avery Johnson said. "I didn't really see it. I just saw them getting tangled up.
"This game reminded me of that preseason game when they came in and felt like they had something to prove. We kind of had that look in our eyes like we're up 2-0. They're thinking March, April and May, and we didn't have that sense of urgency until the fourth quarter."
This is the second time in as many games the Nets and Celtics have gotten into a scuffle. Back on Nov. 28 in Boston, the two teams engaged in a miniature brawl in the second quarter after Nets forward Kris Humphries fouled Garnett hard. Celtics guard Rajon Rondo became enraged and shoved Humphries near the basket, prompting Humphries to pull Rondo's jersey over his head. Meanwhile, Wallace and Garnett exchanged shoves nearby.
As a result, Rondo and Humphries were ejected from the game, while Wallace and Garnett each received technical fouls -- Wallace's second leading to him being ejected as well.
The NBA ended up suspending Rondo for two games without pay, while Wallace received a $35,000 fine and Garnett received a $25,000 fine.
The Nets and Celtics play again on April 10 in Boston.
Asked whether there was any bad blood between the two teams, Wallace responded, "I don't know what you're talking about."
Mike Mazzeo is a regular contributor to ESPNNewYork.com.