I was in a store one day and an interracial couple walked in and all of the cashiers were staring at them?

Because people are too set in their ways. My dad is, well old, 64, and I had a white best friend who he loved. Then he found out she was dating a black boy, and I was no longer aloud to hangout with her. It made me cry because she's still the same exact person, nothing has changed. I don't understand It all.