This isn't dismissing, this is respecting that this is a risk factor in involving Japanese contributors.

Please reread what you wrote and try to see if you can see how it comes off as at least culturally insensitive if not outright racist.

I live in Japan so I have seen what danieltanfh95 describes many times in person. Japanese people at work seem to have infinite patience with whatever random bullshit their company will ask for, but outside of work they get easily frustrated when things don't go the way they expect.