Not aware of historic discrimination like this against white people:
You can't separate current events from their historical context. It wasn't even a generation ago that signs like these were posted in places around the world. Hate to be unpopular by pointing that out around here, but history matters and we haven't come far enough yet for you to ask people to simply forget about what they and their parents might have lived through. Sorry, we don't get that right.
"Hey mate, sorry about not letting you into college and denying you from public property when you were young. No hard feelings, all in the past, eh?" Yes, things have improved significantly, but it's still too close historically. Anyway, I think I've said my piece here.