> Not hiring because somebody because they're not a cultural fit is fine (if for some reason you like monoculture).

No, it is absolutely not fine.

One's livelihood should not be determined by an ability to fit into some monocultural clique based on one hiring manager's subjective view of a culture they are not familiar with. I thought companies were trying to accomplish certain business goals, and not build cultural/ideological echo chambers (unless they build that as a product, which I guess Facebook does).

> Determining they're not a cultural fit because they're black, is most definitely not.

Yes, and culture is most certainly intertwined with ethnicity, or at the very least - by location. Should companies be allowed to screen candidates from, say...Vermont, or Louisiana just because it's not a protected discriminatory attribute. Sorry, people of Vermont. You're just not a great culture fit for us.

I'm honestly struggling with trying to come up for any good reason to hold this opinion in the first place.

> Yes, cultural fit is subjective - but so are interviews.

This isn't a reason to throw out one with the other. Just because interviews are flawed is no excuse to discriminate based on culture. Not to mention there at least exist frameworks for testing skills and ability (no matter how flawed they are). There are no frameworks for testing "cultural fit", and, at least as of now, 99% of hiring managers would not be equipped to be a good judge of culture.