Why do people stare at interracial relationships (I am black and my boyfriend is white)?

My parents, I and my boyfriend attended my graduation. Lots of people kept on staring at me and my boyfriend. Luckily me and my boyfriend did not realise this. Interracial couples were at the ceremony but black men and white women. My mum said to us in the car lots of people was staring at you both and my dad agreed. They gave them dirty looks as this rude.

My family accept him and his family accept me.

Why do people stare at interracial relationships (I am black and my boyfriend is white)?
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