Sceptics say the message of diversity training is that racism is in the eye of the beholder. Put simply: if you think an act is racist, then it automatically is.
The result is a heightened sense of grievance, even when it is not warranted.
Worse still, commentators suggest it could mean genuine cases of racial discrimination get swamped in a mire of less credible claims.
It is hard to judge what the effect of diversity training is likely to be in the UK. We may like to think that as a nation we are better at handling racial issues than Americans.