Would be interesting to see a picture of it and track it down on the internet. I'd doubt that it's affiliated with the government at all. There's certainly a lot of semi-official anti-foreigner sentiment (the English and Chinese 'say no to drugs' announcements in Kabukicho for example), but I think you are right. A lot of 'Japanese only' sentiment is less racism and more language barrier and behavioral.
I disagree, when a sign is posted, it's very racist/xenophobic and very Jim Crow. Language is used as an EXCUSE to COVER the discrimination.
If it's just language, places don't usually post a "No Foreigners Allowed" sign. They ask you if you can speak Japanese. If so, you are in. If not, come back when you can speak Japanese.
Momocafe in Shinjuku is a good example. They have a policy where you must speak Japanese. They don't post racist signs up. They ask you if you can speak Japanese, test you, then thumbs up or down.
By the way, in Hawaii or California, do Americans have a policy where Japanese must speak English to enter our clubs?
My experience has been with places that post a sign, even if you do speak Japanese, they will show their racist/xenophobic side. The next excuse will often be some vague stories about foreigners causing trouble. If you ask for specifics, they will often tell you some lie about an event that happened YEARS ago or happened at a completely DIFFERENT place.
When is the last time you heard of a Western country with a club that banned ALL Japanese because 1 Japanese person had a fight in their club?
We shouldn't be Japanese apologist for their racism/xenophobia.
Over the years, I've had seen many examples of it. And have talked to Japanese owners of establishmets that had "Japanese Only" and "No Foreigners Allowed".
Case in point. Years ago went club hopping in Okinawa, Naha. Was with a half Black/half Japanese pal, who grew up in Japan. Came to a club playing Black American Hip Hop music, of all things.
Club had a sign saying "No Foreigners". But my pal is half Japanese... So we think we might be able to enter, even though I'm American. Nope. They told him, a bi-racial Japanese citizen with Japanese ID that HE could not enter the club.
A year ago, was hanging out in Sasebo. Saw several clubs with the "No Foreigners Allowed". Guess what? My Japanese speaking ability was of no use whatsoever. And if you were White, Black, or Latino then you were NOT getting in. Because it's a race based policy.
Have you seen "Whites Only", "No Japanese Allowed", or "No Asians" signs posted in any clubs in any Western country in the last 50 years? Japan is backwards, and the UN has sent inspectors to Japan who concluded it is a racist country. Their words, not mine.
We should call a spade, a spade. If a Japanese business is posting "No Foreigners Allowed" or "Japanese Only" signs outside their door in 2014, we should conclude they are racist and know EXACTLY what they are doing.
If they wanted to, they could post- "You Must Speak Japanese To Enter", "You Must Speak Japanese", "No Speak English" But that is not what they are doing.
Some clubs I have been to that are NOT racist/xenophobic, but concerned about your ability to speak Japanese or if foreigners tourists/American military might damage their club, will have "Japanese ID Only". Various clubs in Nishi-Azabu had this policy. If you had a work visa and Japanese ID, as a foreigner, you could come in.
"No Foreigners" usually means, "No Non-Asians/No Non-Japanese". "Japanese Only" means "No People Not Of Japanese Nationality". Places with signs like that are usually really racist/xenophobic establishments.