Um.. well, unless you feel different towards black people, I would say that that the color of their skin has no meaning in the dream. However, dreaming of shoes generally represents your approach to life. It suggests you are realistic. If you look deeply into it.. Seeing an African American in your dream generally represents your past. It could mean you need to work on discovering yourself more. It also can mean you are at a time in your life where you need to be more expressive and creative. You didn't explain your dream much so I hope I helped a little! lol
I'm sorry, what is a trainer?? Is it a shoe bluedragonfly?? Erm, anyhoo Raiyo, in dreams blacks tend to represent areas of life you have repressed. Might be time to "tread" a new road in life you've overlooked. What was weird about the trainer? Look to its oddity for more clues as to what you now need to explore. Hope that helps.