A little Mexican boy goes into the kitchen where his mom is baking. He puts his hand in the flour and wipes it all over his face.
"Mom, look, I'm a white boy." His mom slaps him in the face and says "Go show your father".
He goes to his dad in the living room and says "Look dad, I'm a white boy." His dad slaps him hard in the face and says "Go show your grandmother."
The boy goes in his grandmothers room and says "Mira, abuelita, I'm a white boy". His grandmother slaps him in the face and sends him back to his mother.
His mother says "See. Did you learn anything from that?"
To which the boy replies, "Sure did. I have only been white for five minutes and I already don't like you Mexicans."