The Liverpool manager went to offer a handshake towards the referee, only for Moss to carry on walking away.
The forward was dismissed at the Etihad for a rash challenge which saw his boot connect with the face of goalkeeper Ederson.
He said: "Liverpool created a lot of opportunities in those 37 minutes - Klopp was disappointed they didn't create more considering the positions they got into". Of course, I think everyone knows Sadio did not see the goalie. Claudio Bravo proved to be less effective than a hologram in the City goal at times last season, missing simple saves and looking shaky when coming off his line to win the ball, but the Liverpool boss just didn't attempt to test him.More news: China Tightens Cryptocurrency Crackdown
The incident seemed to dampen Liverpool's spirits and the visitors had a let-off when Gabriel Jesus' header was ruled out for offside.
"In the end it is a red card and I am sure enough people will find enough reasons to say it the right decision and we can not change it anymore. I was still positive (but) with one man down against City, it is really not the best place to be", he said. "To get a red card in a game like this is really unlucky".
"It had a big influence on the game".
"It was not a foul but it was a red card and you have to accept it".More news: Aaron Donald ends holdout, will not play Sunday vs. Colts
"When you play 10 against 11 for 50 minutes it is a good advantage", admitted Guardiola.
Jesus and a brace from Leroy Sané secured the significant victory but the afternoon belonged to De Bruyne, and post-match Guardiola stated that they are a "lucky club" to have him in the side.
"But we didn't, and that's what the first half was like, we weren't compact enough and didn't cause them enough problems".
"Yes. He is completely OK", he added on Salah."Yes", he stated, when asked if Coutinho will be available. It was hard for the boys but I don't look for excuses. "What would have happened if we had played 11 against 11?"More news: NASCAR punishes Gibbs, Hendrick, Penske