I don't think it deserves an autosage as it is, but I also dunno if there were posts deleted in that thread. If it's only >>68916 , it could be just deleted IMO
>и какое правило это нарушает?
Rule 7 - Insulting countries isn't b& in itself (even though teh discussion may be likely heading to R7 territory), but I'd delete it for trying to derail a "cultural exchange" thread into politics

Also, while foreign languages aren't banned when there is any situation that justifies it (topic being related to languages/the country, having a reason to suspect the user you interact with can speak the same language, etc), note that posts replying to an English thread in a non-EN/JP language out of blue may be deleted too