I honestly don't understand your comment.
It's pretty clear that the author is bringing these issues up precisely because other employees at Google did not heed the advice you give:
"“Over the last 5 years I’ve heard co-workers spew hateful words about immigrants, boast unabashedly about gentrifying neighborhoods, mockingly imitate people who speak different languages, reject candidates of color without evidence because of ‘fit’ and so much more,”"
In other words, there were many Googlers who did in fact discuss these issues at work.
Sure, it's nice to say, "I would prefer...", but honestly, we would all prefer things to be different than they are. But they're not.
And this is where I really don't understand your comment. Your comment seems to totally ignore the very issue that is explicitly mentioned sub-headline of the article: Apparently, some people at Google not only felt free to discuss these issues in the work place, they did so in a profoundly unprofessional manner thereby creating a hostile workplace.
So stating that "I would prefer...not discussing these things..." doesn't really address the issue that these things were in fact discussed.
That's sort of like saying, "I would really prefer it if my code always worked the way I wanted it to..."
or.."I'd really prefer not to procrastinate so much on HN..."
Don't we all? Alas, that's not the world we live in. The crux of life is what do we do when things happen that we prefer would not happen?
Controversial issues were discussed at work, the author of the memo highlighted the problem and gave solutions, some of which I agree with, some of which I don't, but I think it's important to move beyond just stating our preferences.