Hello.I'm Japanese.  I have never seen these shops, but I understand the reason that these shops are exist.  In city(such as Tokyo and Osaka),there are many Korean and Chinese migrant worker.  Crimes of foreigners rate are most being occupied by them.  I think these shops received severe damage by them.(in paticular,Korean's behavor is terrible in restaurant)    If these shops had prohibited to coming store only to Chinese and Korean, people would regard it is discrimination only to them.  To avoid such interpret,these shops cannot but prohibit to coming store to all foreigner.  __________________________________________________ ___________  Has my English been understood?  I'm sorry coming to here though I am Japanese. (Â´ã»Ïã»`)