And your "white restaurant" will serve everyone? Or just white people?
Well even though the restaurant will be white-themed and will serve white food, anyone is welcome. As long as they behave like white people, but not go the extremes, of course.
How do white people "behave"?
Do poor white people behave the same as wealthy white people?
Do drug addicted white people "behave" the same as those who are not addicted?
Do uneducated white people "behave" similarly to educated white people?
I could go on, but I think those are enough questions.
The point is that there are undesirable as well as respectable people of all races.
There is no "behavioral" monopoly based on race that I have ever observed in my nearly 70 years of living.....at least since the Jim Crow era.
However, in today's political/social environment, you may possibly have a business idea that is viable, so best of luck in your venture.