Send everything he says right back to him.
Seriously first. The racist thing to do would be the contrary of using black bags. A racist would eliminate all black color from his sight.
Now, just start returning the ball. Whatever he says, tell him he doesn't know how offensive that is to you. Or to the Nepalese, like that one you met once in a late night in Bangkok.
"A shovel? Do you know how offensive that is to my ass?"
