If you live in Japan for many years, you see a lot of people come and go. The expat crowd is notoriously transitory, and no subset is more ubiquitously "temporary" than English teachers. Wave after wave of JET teachers come for a year or two, have their bite-sized exotic experience, and then return home with tales that grow ever taller. I have often found myself listening politely as one-year veterans expounded rapturously (and often wrongly) on their insights into Japan.
Not that it rankles.
Maybe just a bit.