This reader points to the main reason why Derb and Andrew are not invited to our diversity training sessions at NR:

Dear Jonah,
Referring to the letter you posted in The Corner regarding
Diversity Training – when I was at [Major Wall Street Firm] they forced all
employees to take a course. During the day a friend and I jokingly
pointed out that we (both being English) felt discriminated against
on account of our nationality (i.e. being assumed to be drunkards,
speaking with a “funny” accent, using the “wrong” words, etc.). The
person running the course assumed we were being serious as,
unfortunately, did many people attending and started a serious
discussion among the group that resulted in apologies and sympathy
for our predicament :)
Worse, on this course and our required Sexual Discrimination
training, the trainers and material seemed to be more concerned with
what we said and what the law said rather than whether racism and
sexism were intrinsically immoral or whether the law made common
sense. I remember a co-worker, who was Japanese (and not racist or
sexist) fail the compulsory test at the end of the Sexual
Discrimination course because he selected the common sense answers to
the questions rather than thinking about what the law would require
him to do… Shame!