Even if you were born and raised in America, you're not truly American unless you're white.
Until then, prepare to be accosted at immigration.
If the definition of what it is to be American is warped, specifically, that it takes more than citizenship to be welcomed home, then that should come into the discussion of these cases of mistreated foreigners.
I think you're effectively minimizing this man's experience with an unfounded (?? maybe just my ignorance) comment about racial profiling.
However, I just feel that his experience opens up a higher level discussion of America's (poor?) implementation of border patrol.
Also, in terms of unfounded comments. There is a chance you haven't read this: http://varnull.adityamukerjee.net/post/59021412512/dont-fly-...
Race is always complex, especially because racism illegal. It becomes a subtle and hard to describe thing. Maybe "random search" is a good way to describe it. Ultimately, it makes me feel like I'm being delusional. I hope I am.
Also, a US Citizen returning to the US does not have to answer any questions (apart from the written customs declaration) and cannot be denied re-entry to the US. (Although, as always, agents may abuse people.)