I haven't spent ten years in Japan, but I have spent some time there. Some of his complaints do ring true especially around civil rights, however his experience of it feels very weird. I was praised for my language skills, accepted and invited to family outings, never had issues with restaurants that had no foreigner signs (after I spoke Japanese even badly it was all fine so long as acted within their cultures manne…
There's real issues with things like the legal system and independence of press, but I think this post wildly exaggerates what it's like to live in Japan as a foreigner. I'm not sure how to explain OP's experience. Maybe he comes off too confrontational? He does call the police "fascists" in another blog post...