Thats basically the racial composition of the U.S. Indeed, people of color are over-represented in that jury.
The US racial demographics are White: 64%, Hispanic: 16%, Black: 12%, Asian: 5% 
Looks like Blacks and Latinos were overrepresented on that jury.
When comparing proportions (in this case racial makeup of juries versus racial makeup of the population) you want a sample size large enough that you have at least 5 expected cases for each group. In this case the expected cases are the population proportion (p) times the number of jurors (n). So you would need n * p >= 5 and since Asians are the lowest proportion at 5% you would need data on at least 100 jurors. Then you could do a Chi-square goodness-of-fit test to see if something is really going on.
If it seems like I'm being geeky it's only because I just recently worked on a problem exactly like this, determining if jury demographics matched population demographics. Turns out in many cases there IS something going on, but then the reasons for it aren't always what you think. One reason is that in some communities there is a shortage of eligible jurors due to high rates of felony convictions.
Since the author wrote anonymously (and understandably so), there's no way for us to know either way.
Those minimum case numbers are needed in order for the central limit theorem to be applicable in the statistical analysis.
There was one black woman and no black men , so that should be 1/12=8% Black. I don't see anything in the article that lets us figure out what category the author belongs in. He's a male non-black non-latino who describes himself as a person of color, which leaves open a lot of possibilities.
 "Every black man had a story: police harassment, spurious arrests, intimidation. They were all eliminated"
The sample size is too damn small!
Added: I guess I'm not used to the term "person of color." It means "a person who is not white or of European parentage." Many people other than blacks and latinos could identify as people of color.
What the hell? Are you saying that people of color are automatically peers with each other because of their race?
peer: a person of the same age, status, or ability as another specified person.
If that is your defination of a peer then it is likely this person was not judged by their peers...
a "peer" to the government is any citizen living in the jurisdiction of the court forming the jury....
The United States is a white majority country. Of course the majority of jurors are white, even when the defendant is black.
Perhaps you need to read this again
The author himself is a black man.
> two men of color make it to the jury, and I am one of them. The other is Latino.