It's impossible to have anything exclusively Black because our families are integrated

I take this to mean "We wish we could exclude everyone that's not black, but some black people have white spouses, so in order not to reject black people we will accept those white people who are married to black people."

I assume you think it is not objectionable to establish a city as a safe haven for white people, where white businesses will support each other, that is intended to be pro - white in every way so long as they don't say they will exclude anyone. And you must also believe that it is okay to have a sign on the schoolhouse door that says "This school is for white people," so long as it doesn't also say "Black people are excluded". Wow! You're all in on your racism!