Many young keepers would be mentally scarred by August's 8-2 trouncing which threatened to send Arsenal into meltdown - but not Szczesny.
He said: "I don't remember that game at Old Trafford, I don't know what you're talking about!
"It really doesn't matter to me. I just focus on every single game and what happened in the past, happened and I forget about it.
"Whether we lose 1-0 or 8-2 we still get the same amount of points. We lost that game, we were disappointed, but I was over it very quickly.
"I wouldn't say I was embarrassed, I'd say disappointed.
"You are always disappointed when you concede a lot of goals - although it really doesn't matter to me how many we concede as long as we win.
"At Chelsea last weekend, I'd much rather win 5-3 than lose 1-0.
"We've got a few good results but we still have a point to prove and I think you have to judge us over the course of the season."