What would happen if a member of the KU Klux Klan foun a white boy dating a black woman?

I'm sure that the Klansman would be quite stressed but it is likely that the couple would know nothing about his feeling because for him to act on those feeling may be breaking the law. If he said something to the couple, it is likely that they would not care how he felt. The Klansman would be in a small minority in today's society and unless he did something to vent his feelings illegally, he is free to think what he wishes.