Yes I know too, Japanese people are the most racist and xenophobic culture in the world. Thank God they’re getting less and less, soon 80% of them will be over 70.

The real reason is that Japanese men are scared of the competition. It's a biological fact that most aren't well endowed enough to pleasure women, so they need to keep Japanese women from experiencing sex with non-Japanese men.

It's all penis envy at the end of the day.