I've commonly said that the Japanese are Germans to strangers and Italians to family and close friends. Sometimes as a quip I add that they're Irish in the bar, lol.
Japanese society is not really safe harbor for Japanese on the spectrum. It is, however, quite gracious to foreigners. As a foreigner no one will say anything to you, for instance, if you use the wrong honorific or something; most will be impressed that you can speak the language at all.
Once you've been living and working in Japan for some time and have started to assimilate, though, you are on and you've got to perform the appropriate rituals or people will start to think you're being aggressively rude.
Japanese society is not really safe harbor for Japanese on the spectrum. It is, however, quite gracious to foreigners. As a foreigner no one will say anything to you, for instance, if you use the wrong honorific or something; most will be impressed that you can speak the language at all.
Once you've been living and working in Japan for some time and have started to assimilate, though, you are on and you've got to perform the appropriate rituals or people will start to think you're being aggressively rude.