It seemed that, in Trout's scenario, his primary concern was this gentleman's ability to speak clearly - which would be critical to the position offered up in that situation. To me, it didn't appear that Trout was making any correlation between the man's speaking ability and his race. Race was mentioned, but only to give context to the question, "Would I be racist for not hiring him?"
You responded "Yes". Perhaps you feel it was unnecessary to acknowledge race at all, but in that case this hypothetical is pretty much moot. I felt like Trout's question was something along the lines of, "Am I racist if I didn't hire an under-qualified applicant who also just happened to be black." Seems simple enough, but apparently not.
I am also open to the possibility that I completely missed something that you did not, or that I might just be an idiot.