http://shanghaiist.com/2016/12/30/shanghaiist_2016_embarrass...
https://www.nytimes.com/2016/10/11/world/asia/bad-manners-ch...
http://www.japantimes.co.jp/opinion/2016/10/07/commentary/wo...
However, I can comment on the "Japanese only" signs. I've never actually seen one myself, but I know they exist in some places. An acquaintance of mine is well connected with a particular sumo heya (a "heya" is essentially a group of sumo wrestlers who live and train together along with their trainers and staff). It is popular (and fun) to go and watch the wrestlers train in their heya, but one is sometimes confronted with the "Japanese Only" sign at the entrance.
My acquaintance is not Japanese (he isn't even a resident), but like I said, he is well acquainted with the heya. One time, he asked some visiting foreigners if they wanted to watch the training and they were delighted to accept. When they got to the entrance they saw the sign. "Is it really OK?", they asked.
"It's fine. I've made arrangements. As far as the heya is concerned, if you know how to make arrangements to visit the heya, then you are Japanese".
Living in Japan can be very difficult for people who are not culturally Japanese. There is a weird inside/outside culture where either your are inside with a bunch of strange rules that you have to follow (and know to follow, somehow) or you are outside (where you don't really need to know or follow any rules). What "Japanese Only" means is that they only want people who know what the rules are, know how to follow the rules, and most importantly, are willing to follow the rules to the letter even if they think the rules are stupid. If you can do that, then you are "Japanese enough".
Generally speaking, there are few cultures in the world with the same kind of byzantine rule following culture that Japan has. Many cultures are literally morally opposed to blindly following rules. People from those cultures often have great difficulty in certain circumstances in Japan. However, if you show that you are willing and able to surmount those hurdles, my experience has been that most people have no trouble accepting you as Japanese.
* Don't wash your feet in the sink (Chinese and Arabic only)
* Don't squat on the toilet seat (Thai and Chinese only)
* Please wash your hands (English and Arabic only)
I was aware of 'trench' style toilets existing, so the directions for south-east Asian languages make some sense.
I wasn't aware of the 'foot washing' practice though... that seems odd.
The English one is for other foreigners and the kanji one for Chinese because most of them can't read/speak English so "Japanese only" sign wouldn't mean anything to them.
I think 絶 is the Japanese equivalent.
Simplified Chinese would be "(谢绝)(中国人)" = "(politely refuse)(Chinese person)" = "(verb)(object)", which is correct Chinese grammar.
However, 謝絶 seems to be a noun/suru verb in Japanese (http://jisho.org/search/謝絶), so I think the equivalent phrase would be "(中国人)(を)(謝絶)(します)" = "(Chinese person)(object of)(polite refusal)(make)" = "(object)(particle marking object)(noun/suru verb)(inflected form of suru)".
Disclaimer: I am not a native speaker of either language and didn't have much in the way of grammar lessons, so this might all be horribly wrong. I'm definitely open to corrections ;)
I was saying something simpler: One Chinese-only character is enough to show it is not Japanese.
Is your answer genuinely "I would let myself and those I care about suffer an unlimited amount of harm in order to avoid the possibility of inflicting an unfair prejudice on any individual"? Because according to your stated position, anything less is "defending racism".
And I strongly suspect that, if it were put to the test, you really would not accept arbitrary harm in order to "not defend racism". And if so, then you're publicly declaring that you hold a 'virtuous' position, when in reality you do not. And that is the definition of 'virtue signalling'.
Of course there's a practical limit to tolerance. This isn't it.
Said he, before proudly hanging his "No Irish" sign on the front door of his shop.
But this is a mild example that doesn't cost me much. I think it's an important thought experiment to figure out just how far you'd go and how much loss you'd accept to preserve that self-image of being "a good person."