That's unfortunate. Seems part of the same culture where, for example, a player will take one in the face and her team mates stand around aloof, dumbfounded, and wait for Kosheleva to come under the net and offer support.
I imagine life behind closed doors is pretty brutal in Japan.
Strangely, and much to my chagrin, I've seen High School coaches get angry with players, and have seen one of them push a player, a kid, in the back ... to get her off the court after making a service error.
Remember that there is a phrase, "the nail that stills out gets hammered down." As a foreigner, you will always stick out. Not to say that you can't fit in, you can. However, you can get away with some things from time to time because you may not understand why people do things in a different culture. In Japan, there is plenty of hazing of people as part of the senpai-kohai (senior-junior) relationship. I lived in a private dorm and when new students entered the dorm in April with the new school year, some senpai (guys already living in the dorm) would have these kids screaming to introduce themselves. And they had to do it to every one in the part of the dorm that we lived in. When they came to my room, I just said, no screaming. They were surprised but I wanted them to feel comfortable and as a foreigner, I was different and did not have to go through the hazing. Not saying that I did not like the hazing, but it was not just not something that I had any desire for.
Still many coaches in Japan, are basically disciplinarians. If you can watch Kana Oyama's work through goo tacchi (fist bump) on youtube were they often work with kids who are not winning, they really have to work on technique with kids. Even talking with the kids about challenges and learning. Many coaches of kids forget that kids may love the sport, but need to improve their skills to love it even more.