But Aguero's strike kept City a point above their rivals, who have played a game more, and provided a moment of solace after their mid-week Champions League elimination at Monaco's hands.
The England defender has been a mainstay of the City back line this term despite Guardiola often rotating his defensive partner, but after making his 36th appearance of the season, the Catalan was full of praise for the 22-year-old.
City unambiguously targeted the flanks, Leroy Sane on the left and ex-Liverpool man Raheem Sterling on the right whipping a succession of low, pacy crosses across Simon Mignolet's six-yard box.
The pressure to secure Champions League football was evident during Sunday's tense affair, though Liverpool arguably should have walked away with all three points.
Liverpool boss Jurgen Klopp said of the midfielder: "He's one of the best if not the best player technically I ever worked with".
"It is one of the most special days of my life", Guardiola said, as quoted by the Daily Mail.
'I am delighted to have John with all the huge amount of mistakes he has, I love him.
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But whereas most managers would square up to one another and carry on, the pair quickly made up with a pretty freakish - yet hilarious - high five, instigated by Guardiola (see below). But it is not easy to play central defence with this manager.
"He is a German and I am a Catalan so the influence in our cultures are much different".
"He is Spanish", Klopp said about Pep's comments on how important the draw was for City. "Unfortunately we didn't score the chance we created but I think we played good against a good Manchester City". "But these things can happen".
"A point is okay - definitely more positive than a defeat".
The Argentinian said: "The same that he said in the press conference he said to us".
Manchester United are in fifth with 52 points, four behind Liverpool, but with two games in hand, while Arsenal and Everton, who go to Anfield for the Merseyside derby immediately after the worldwide break, are level on 50 points. "One goal a year", he said with a smile. "That is then well deserved and all the rest fight with all they have for the Champions League".