Not that long ago, when I was a teenager, that particular rant would have/could have gone like this:

You say to me. "Don't you KNOW anyone in a mixed marriage...well of course I do. Two or three, but I know literally hundreds of people who are married to people of their own race, who went through a marriage ceremony and believe marriage means the joining of a man and woman, but that race mixing is just wrong. To many people in my neck of the woods, their wedding day has been, or will be, the most important of their lives.   They spend money on the big day, everything has to be perfect, the wedding album has pride of place in the home, the wedding picture will sit beside the pictures of children and grand children.
Most of these people see mixed marriage as a perversion, and to have to recognize the marriage of a black man to a white woman just diminishes the status of their own marriage.

Hopefully, times will continue to change.