Arsene Wenger felt Stoke were awarded a "very generous" penalty on Saturday but admitted Arsenal made poor decisions.
Referee Mike Jones pointed towards the spot in the 76th minute of the Premier League clash at the Britannia Stadium, after assessing Laurent Koscielny's handball offence from Jon Walters' flick.
Walters stuck away the penalty himself and Arsenal were unable to carve out an equaliser as they lost 1-0 and slipped four points behind leaders Chelsea in the title race.
"It was a tight game that we lost unfortunately on a very generous penalty," Wenger told Sky Sports afterwards.
"Apart from that, I felt that in the first half we had opportunities where we made the wrong decision and chose to take a shot instead of giving the ball, in two or three occasions.
"In the second half, when we started to really push them back in the final third, a counter-attack on the long ball got them a penalty.
"Nobody knows any more what is handball and what is not handball. How many times have we seen that? I can show you 10 situations where the ball hits the hand and it's no penalty. The hand didn't go to the ball."
Despite his dispute over the penalty, Wenger admitted that his Gunners side had to blame themselves for their defeat. With 10 games remaining, their title odds have drifted to 20/1 with Sky Bet.
"It wasn't our sort of day, because we made it that sort of day," he added.
"Offensively we didn't create enough and they defended very well. We have to look at ourselves and win our games, and our performance today was not good enough to speak about the title. That's what we have to realise when we go home."
One Charlie Adam challenge on Olivier Giroud left the Arsenal striker in pain, but Wenger had no real complaints.
"I think it was a physical game," said Wenger. "We know that Stoke has the highest number of fouls in the Premier League - we knew that before the game - but if you have the right sort of commitment, you can create dangerous situations."