"It's always difficult when you go back into a tournament against teams you have coached before and you don't know how to play it.
"Do you go reserved or get stuck into them? I know what I do.
"Even in a country like Ireland where I coached for many years. But that is the choice he wants to make and thinks that is the best for his team.
"There was a lot a vitriol about Australia his home nation where he coached and opportunities were given to him to grow up as a coach and play.
"Personally, if you want to leave a legacy somewhere you don't hit back at it do you when you leave."
Cheika is yet to hear back from IRB referees chief Alain Rolland and said he doesn't expect to after he called for a hearing with the Irishman after his side were pinged 13-3 in the penalty count against Ireland.
"I've got nothing from him. You'll have to ring him and ask him where it's at," Cheika said.
"I made my calls the other night, the ball is in their court now.
"If they do want to get back to us, I don't know. We'll just see what happens.
"I've got to think more about this weekend than what happened last weekend right now."