I'm a bit torn, I have been to at least one restaurant with my black GF and I felt like they might have given us bad service and cold food to keep us from coming back. Might be better to just say you don’t want us there so nobody wastes their time.
And on the other side of the coin, I was at a gay bar with a few of my friends. I went out for a smoke, meanwhile the door guy showed up and wouldn't let me back in even though my coat was in the coat room. To be fair, that might have had more to do with the way I was dressed rather than being straight.
It does raise the question; Is it ok for for gay people to keep straight people out? And what about women only business? I used to fix fitness equipment and regularly went to a chain of women only gyms. Why is that ok?