I've been reading a lot today about people...well, not just normal people really, Star Wars fanboys...offended by the idea of a black stormtrooper.
30 YEARS after the fall of Palpatine and supposedly the Empire at the end of "Jedi." Why do they still have to be using clones of Jango Fett fifty years or so later?
If you've got problems with a black stormtrooper (to misquote Jeff Foxworthy), you may be a racist.
If somehow you've actually got quibbles about the actor's performance in the five to ten seconds we see him, rather than the color of his skin, then maybe you're not a racist. You may want to withhold judgment until you see more of his acting, though.
On the other hand, the soccer ball droid looks ridiculous. Feel free to bash on that.