Actually, it was quite spot on. From a personal standpoint, I always loathed comments like, "You act white", especially when given as some sort of compliment. It was, as you allude, in fact a great insult cloaked in the idea that said commentator is separating me from my culture because they view me as distanced from it. My reason for my manner of speech etc has always been the following idea: I speak one language; despite whatever subjugation of my ancestors went into speaking this language, it is no less the language I speak today--as such I see no reason not to attempt to master it. I think prior to civil rights etc, a lot of these people would have taken such as a compliment; I mean, some blacks with more admixture would attempt to literally pass for "white"--white being "purely" white as governed by the one-drop rule. However, today, it seems that people are less likely to say, "I am a white black man" rather than "I am an intelligent black man". While you could argue that the latter is still admitting some subjugation and admittance to stereotype, it is a far cry from "I act white".
Furthermore, Hip-Hop to me is the ultimate trolling using re-appropriation; it has taken common aspersions such as "nigga" and behaviors and made it something quite lauded, desirous (at least on the surface), and ultimately profitable. Some of these artists, if not for their skin color and features, seem to be almost in black face--doing everything and anything to amplify their perceived physical prowess. But is it admitting subjugation? Somewhat, as with any other culturally re-appropriated idea or measure, but it is done because it is in jest and lucrative. To some extent, people desire to be as powerful, in the moment, and headstrong as these people portray. I don't think it's purely coveted by whites. I think we're moving into an ideal that involves more cultural integration, but again, we could go into this in great lengths.