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This doesn't mean cognitive bias in a LW sense, it means everyone is racist, specifically against black people. I also don't think its true - if everyone is a little bit racist, why would people get into interracial relationships? Its possible that the majority of people prefer their own race but don't admit it, indeed the fact that racial groups cluster in cities could be argued to show this is the case via revealed preferences, but it seems obvious that some people have no racial bias.
This, like all politics, is far from rational. It starts by painting the issue in terms of 'people who disagree with me are cowards' and proceeds to assume that this discussion must conclude that the bias exists.
There are many attributes of possible partners that make me less likely to data them but that at the same time aren't deal breakers. The fact that I have a theistic girlfriend doesn't mean that I wouldn't prefer a girlfriend who isn't theistic all things equal.