Read about Obama's take on the phrase "acting white" in the article below:
http://m.washingtonpost.com/blogs/post-partisan/wp/2014/07/22/obama-goes-there-on-acting-white/
An interesting, thought-provoking quote:
"'Acting white' and its ugly cousin 'not black enough' are noxious putdowns meant to foment a sense of betrayal. Those who employ it believe their targets are so ashamed of being black that they value things considered the provenance of white people to be superior to all others."