It's seen a s a really bad manners, but no one will tell you that you are bothering them because doing so would also be bad manners. So just avoid doing it when you go to Japan
Sounds like a them problem. And if they can't even be arsed to speak up about it, sounds like two them problems to my zero. Tough break.
THE FIGHT WILL CONTINUE, AS LONG AS THE AMERICA INSIDE MY HEART IS STILL ALIVE