Very, and familiar enough to know that Japanese immigration laws do not dictate that foreigners must have private conversations in Japanese. Just as American immigration laws, enforced or otherwise, don't require private conversations in English only.
You're using this reference to laws as a dodge, Earlier you were implying that the Japanese were somehow more tolerant of foreigners than Americans. Nothing could be further from the truth. Japanese society is inherently racist. So is Korean society for that matter.