Gaijin who choose to move to Japan are members of a tiny, somewhat
weird subset of the people in their home countries. Regular,
normal, everyday people from Western countries don't drop everything to move to Japan. Instead they follow the more
normal path: graduate high school, some go on to college, and after school they immediately start working at a job(s), which they continue doing for 40+ years until they qualify for retirement, at which time they maybe go on a cruise or two, maybe even venture out of their home countries on some kind of a package group tour, and then they die, most of them never having left their home country.
Japanese are pretty much the same in this respect: "normal" Japanese people don't usually move abroad, ever. They finish school, start work, never take off for more than a few days in a row for 40+ years until they retire and then eventually die, most never having left Japan. Japanese people who choose to move abroad to study, work or just live at some point in their lives are a tiny, tiny minority of the Japanese population as a whole.
There are tons of cool Japanese people who are living really interesting, exciting lives somewhere outside of Japan. The thing is, when Westerners travel to Japan to teach English or whatever, we don't meet these really interesting, cool Japanese people, because they're all off living somewhere else, teaching Japanese in San Francisco or climbing crazy high mountains in the Himalayas or paddling kayaks across the Pacific or whatever.
I have a Japanese artist friend who just picked up, left Japan and moved to Jamaica on a whim when he was in his 20's. He tells stories of learning how to spearfish to catch food to eat because he went to Jamaica with almost no money and smoking huge amounts of ganja with Rastafarian dudes he met there. Now, my friend is in his early 60's, and a month or so ago he emailed me some photos of himself, wearing a beret, and sitting in a cafe in Paris with his French artist buddy. He's not a
normal Japanese person.
Where I live now, in Hawaii, there are many, many Japanese expats, some of whom have been living abroad for most or all of their adult lives. Almost all of these Japanese expats would be considered
weirdos in their home country because they don't really fit the mold of what a Japanese person is
supposed to do with his life. I know two Japanese guys who studied English really hard so that they could pass the test to become boat captains. Now they've both got their own businesses taking Japanese tourists out to see dolphins and whales and swim with manta rays. I know another Japanese guy who is a world renowned free diver. I know several middle-aged Japanese people who dropped out of typical Japanese society to become university students in Hawaii. Most of the Japanese expats I know are kind of
stuck living abroad, because now that they're in their 30s or 40s or 50s, it would be really difficult for them to return to Japan after having lived abroad for so long.
Those of us who study Japanese and choose to move to Japan to live for some years of our lives are basically a bunch of "weirdos" compared to our more
typical counterparts who choose a more conservative path of staying in our home countries. I say this as a person who has done this in the past and is considering doing it again sometime in the near future, so please don't be offended. I actually much prefer people who are a little
different.
Problems arise, though, when you take people like you and me who move to Japan to live, work and study Japanese, and you put us together in a work environment with
typical, conservative Japanese people who have taken the more cautious, careful,
normal, route in their lives and stayed home in Japan, taken a job right after school and never ventured much out of their home country. IMO, that's where the problems arise. You take a self-selected group of gaijin
weirdos who dropped out of the societies in their home countries and moved to Japan and put them together with normal, typical Japanese people who think it's a big deal to take a 4 day/3 night package tour to Hawaii, once in their lives. Of course they're not going to get along.