How do you explain the research that certainly strongly suggests there is such a bias? And given that the bias is assumed to be unconscious, how can you be sure that you don't also have similar biases, affecting your judgement?
Well, for one - the study and research were done in Israel, not in the United States. Despite the author's conjecture that "The results should apply in the United States as well" - Israel is NOTHING LIKE the United States in education, culture, or....well, a lot of things.
What if I visited the Ivory Coast, or the Congo, or Nigeria, and did a study on elementary schools? The headline would read, "New Research Shows lack of White students affects diversity."
Then I wrote a research paper about how there's not enough white children in schools. I'd give that study about the same merit. Israel has radically different social bias - they are virtually a country of martial law - justifiably so because of the daily threats they live with. Their educational system reflects that. Applying it to the United States is bollocks. Israel doesn't learn about slavery and the U.S. civil war, or about our political system or national pastimes in school. Seriously, bollocks.