Is there a reason fast food restaurants turn out to be dictator abusive bullies and racist?

I dealt with so many abusive managers where everyone else is Hispanic and I am African American and the workers and managers always gang up on me. I don't understand why they would let me struggle to do all the orders by myself and have customers scream at me and threatened me because I can't get the food out fast enough. People always defend their race over me. If someone does something wrong, they tattletell like a whittle baby they are and the stupid managers get mad me. The play favoritism, they are so sweet and kind to their race but mistreat me as an African American girl. This is the 5th time I literally felt like suicide because of these stupid fast food restaurants.