Anthropologically speaking, this is a classic example of "spiritual pollution."
People who are sick, women (becasue of menses) and persons who touch dead things are considered "dirty."
Usually, you only see this in "primitive"cultures.
(we dont use that word ((primitive)) professionally, but it is useful for laymen, so we do use it sometimes)
I find it very useful to look at cultures of Oceania when trying to understand the Japanese. Despite their declarations of uniqueness, they share a lot in common with those cultures.
In the big cities, you dont see this so much. People there are arseholes, but they are less likely to start acting like the peasants from some Kurosawa flick.
Out in the country, those stone-age beliefs start to appear.
Hey, I am one of the "hinin".
(I have a large japanese tattoo, it covers all of my back and buttocks and upper thighs) I am a dirty "irezumi."
And yet, I am a white skinned, blue-eyed American who teaches these people's children.
I LOVE making Japanese people reconsider their assumptions about class and caste and democracy and tattoos and freedom of expression and racism and all that!
The last time I heard some guy start talking bad about people with tattoos, i said " oh really? My gandfather had a dragon on his chest and he was a school superintendent. My brother, sister, sister in law, and several cousins have tattoos. Maybe you should be more careful before you insult my family again.."
He never opened his mouth around me again. I said it in front of the entire staffroom, so I am hoping that this idea spread out from me like a social bug-bomb and stimulated a little thought.
Will they re-think their racist assumpitons ?
I dont know.
Will they try not to spew that derision in front of Japanese- speaking foreigners who are willing to call you out in public?
probably , and that's a step forward, isnt it?
Over here, it is considered "immoral" to correct people in public.
It is also considered "immoral" to complain.
I have done as much as I could to try to remedy that BS.
Like I said to one teacher " If nobody ever complained, we'd still be using stone tools."