The north Londoners were 4-0 down within the first 20 minutes against the Reds and the Pole has urged his team-mates to bounce back against the champions on Wednesday
The north London club's title credentials took a huge dent at Anfield on Saturday, as they slumped to a humiliating 5-1 defeat after conceding four times in the opening 20 minutes.
Polish shot-stopper Szczesny says Arsenal's performance was unacceptable and has vowed to ensure that there will be no repeat of their Liverpool collapse when they meet David Moyes' struggling United side on Wednesday.
“We represent one of the biggest clubs in the world and what we did early on is not acceptable,” the 23-year-old goalkeeper told reporters.
“We said that at half-time, we went out in the second half with a different attitude and it was much more of an even game.
“But as I said we will learn our lesson from this and respond quickly against Man United.”
The Gunners' were overtaken at the top of the Premier League table following the weekend's results, with Chelsea moving to the summit and Liverpool closing to within five points of Arsene Wenger's men.