You should offer to compromise by reducing the differences in price by a factor of two. Perhaps even agree to charge whites and Asians the same price. Even agree to sell to everyone at the same price, but leave the old prices visible.
The true racists in this case are those who can't justify preferential admission policies and who don't want that issue to be visible. That is what creates the anger. Try adjusting the prices so that the difference is almost negligible. They will still be unhappy.
That is a good point. Most people can tell you in great detail what they don't want but one way to silence them is to ask them what they want.
Everytime they say something play the Columbo technique and say,"I not sure I understand what you want, can you please tell me again?"
Do this in the written response that is planned.