It's not what private companies should do, but public education agency should do. "Do not discriminate those who have different race , different ethnicity, different sex , different household income, different hair・・・from yours" is what you should learn in elementary school.
It's interesting that there are many people who can deal with difficult tasks, but cannot keep such a fundamental morale.
Their motivation to discriminate different groups would be self-confidence that their group must be superior to the others.
They should behave more modestly and think everything about objective viewpoints.
That's the first step to realize peaceful world.