Arsenal assistant manager Steve Bould sympathised with disgruntled fans after Wednesday night's 2-0 Champions League defeat by Schalke at the Emirates Stadium.
Klaas Jan Huntelaar and Ibrahim Afellay capitalised on slack defending to score in the final 15 minutes in the Gunners' first home defeat in the group stage for nine years. Angry supporters left in their droves once Afellay had put the result beyond doubt and the few that remained booed at the final whistle.
"We've lost at home and of course they're frustrated. We are as well," Bould said. "We don't like losing football games, but we have to pick ourselves up and start again. We haven't played anything like we can - that was the big disappointment."
He added: "We haven't performed and we lacked confidence, for whatever reason.
"It's a tough competition and Schalke are a good side who beat Dortmund at the weekend.
"They're doing really well and a 0-0 would have delighted us. We looked like we were going to get away with it for a long time.
"We looked jaded - I don't why that is. Since coming off the international break we haven't performed. We were very sharp against West Ham but since returning from the internationals we've been jaded."
Arsenal were restricted to just one shot at goal in the entire match and had to wait until stoppage time for that, with substitute Serge Gnabry producing a late attempt.
But their failings in their own area were more damaging with both goals - just reward for Schalke's second-half dominance - exposing a fragile defence.
"The lack of chances isn't worrying, but it's not what we want or are accustomed to," Bould said. "We normally create chances and now we're not, so we need to correct that."