Are some racists truly dumb?

See I'm half Visigothic. Here's where the dumb racists come from -- actually not even the Avileses are this stupid. I'm Guzman (it was said about this site, the white, "bro"-hating "Friends"-watching half of my family). Someone in my Rivera family (I won't name their names) said I was gonna come out dark because of my father's family. WHAT THE HELL? Does that nimrod actually know that Visigoths (-ez surnames) are GODDAMN white? And they acutally think their race is white. DUMB. And second, they probably think "bro" is black or white (Visigothic included).