Well, apparently your complaints made back in the 80s fell on deaf ears and there weren't enough people who agreed with you.
Ironically... the same exact thing a few people were saying about OA back in the 80s. And its only now taken 30+ years for people to act on it. Maybe it's about time you should start re-petitioning to get the offending manga removed? Maybe it will happen this time.
The difference is that I NEVER complained about it in the '80s, and won't do it now. As I already said I had enough maturity in my teens not to get offended by inaccurate or comical portraits of my country and language, whether that was in Asterix comics, Japanese manga, American comics, Mel Brooks movies...