Huh? Where? Why?
I'm black, and my wife is white, but we've never had any kinds of doors closed to us. You sure you're not living in 1940? Wow.
The most extreme example was when I took her and my two kids to a gun show.
At one table the guy gave a Hitler salute and said “Seig Heil”. The guy at the adjacent table refused to even talk with us let alone sell us something.
The majority of the vendors were fine though.