The fact that white Americans favor white Americans over black Americans might be because of stereotypes but they also might be of in-group favoritism.

白人喜欢,白人，而不是黑人,可能是因为刻板印象,也可能是由于组内偏爱的心理。

耶鲁公开课 - 心理学导论课程节选

I think the answer is that both play a role but some of the effects are due to stereotypes above and beyond in-group favoritism.

我想两者都有,但刻板印象的影响,要高于组内偏爱。

耶鲁公开课 - 心理学导论课程节选

So, African Americans also are biased against African Americans and in favor of white Americans, showing it doesn't reduce to group favoritism though that probably plays a big role.

所以黑人也是,对黑人有偏见,倾向于白人，这样表明组内偏爱,所起的影响并不大。

耶鲁公开课 - 心理学导论课程节选