Arteta missed the chance to give Arsenal the three points after his late penalty was saved.
Giroud told arsenal.com: "It's a bad run but I think there is a lot of quality in this team. We will have better days in front of us.
"I think Mikel wanted to score because he made a penalty against us. I think he really wanted to score.
"I was confident. Some guys asked me why I didn't take the ball but before the game the boss [has] a penalty list. It's very difficult because Mikel was under pressure because it's the last minute. It's not very easy to shoot a penalty."