The Gunners are currently in the Far East to play four fixtures ahead of the new Premier League campaign.
"It's the first time I've seen that," Giroud told the club's official website.
"It's amazing, it's incredible! It's the first time for me in Asia and it's nice to come here for them because they really support the team in an incredible way."
Arsenal continue their tour against Vietnam at the My Dinh National Stadium on Wednesday.