Hater Babies

In this article, psychologists discuss the formation of social bonds in infants.  In this experiment, it is shown that babies respond positively to people who harm those who are different from them.  Note, however, that the differences in this experiment are not physical differences but are personal preferences, such as which cereal they like.  I thought this was apropos to our discussion about what kinds of experiments would need to show that the race instinct is natural and not the result of social learning.  How might an article like this weight in on the debate?