Are my parents racist? (Long description)

So my last bf was Mexican my current bf is black. I'm mixed (black and white) and my mom only dates black guys. Her long-term bf is black. When I was with the Mexican boy they never let him in the house or let me go out on dates with him much. One day we were dancing in the driveway when my moms bf pulled up and later he told me that it was inappropriate. But usually when you dance you have your hands around a girls waist. And they told me I didn't have self respect because I let him touch me like that. And even though they never gave him a chance and try to get to know him, they claim they never liked him. Fast forward to today I'm dating a black boy. When they met him they had a whole conversation with him and tried to get to know him. They even recently let him come over. We made out in the living room too! My mom walked in when I was sitting with my logs over his, holding hands and he was cupping my butt. But she has nothing to say about it. So you think they have a thing against Mexicans (dating their daughter)?

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