Guardiola exchanged heated words with Nunez after the 1-1 draw at the Etihad on Saturday.
Liverpool boss Jurgen Klopp was forced to play peacemaker as the feuding pair tried to confront each other.
When asked by talkSPORT to explain what happened, Guardiola said: "Nothing."
The Spaniard then walked out on the interview before any further questions could be asked.
Meanwhile, Liverpool manager Klopp joked about his role as peacemaker and emphasised nothing dramatic occurred.
READ MORE ON CITY V LIVERPOOL
Alexander-Arnold was 'nervous as a kitten' but Liverpool star silences Man City
Liverpool face 'massive' blow as boss Jurgen Klopp fears injuries for key duo
The Reds boss told talkSPORT: "That's the story of the world, huh? A person who doesn't understand a word trying to calm down two people.
"It's fine, it's just emotions, nothing else. Because love them both, I was probably the perfect person to do that.
"But nothing spectacular. Emotions."
A spectacular game between the Premier League's top two ended all-square after Trent Alexander-Arnold cancelled out Erling Haaland's opener.
Most read in Football
Reece James tells Jason Tindall to 'sit down' as pair clash over Joelinton 'clothesline'
Why Brentford vs Arsenal is kicking off at 5:30pm as TNT Sports move London derby
Ex-Man City and Liverpool stars disagree on-air after Dias goal controversially disallowed
Nunez clashes with Man City boss Guardiola as Klopp forced to hold Liverpool striker back
Haaland became the fastest-ever Premier League player to reach 50 goals as City capitalised on a mistake from Liverpool goalkeeper Alisson in the 27th minute.
The Reds absorbed long spells of City dominance to equalise in the 80th minute through a stunning Alexander-Arnold strike.