"Think about what you would have told a white man"
Well that leads to something like "Toughen Up, It's Part of the Job".
I don't think it helps to activly missunderstand people, when they are trying to be helpful EVEN if their trying is in the wrong. Try to think about the intention and maybe ask what they really meant by that.
I did't want to hurt you, but i don't see the path to a better world to just think the worst of people. The most people want to be good and create good things, sometimes they don't know better ...
I don't say you should not fight back. Racism has to be fought!
I hope we can all agree that in 90% of the cases we can hear on the tone in the voice what the poster meant. If unclear ask and if racism occurs report the ** out of him :D
My advice to you: "Think about what you would have told a white man"