Are blond jokes racist?

Since we live in a society where everyone is hypersensitive about racial differences, blond jokes should be considered hate speech since blonds are mainly of Scandinavian ancestry. For one, these jokes are often of a disparaging nature: blond women are dumb. This speaks both of ism and racism. Jokes of this nature should be eliminated from our society. We could not make similar jokes about women with afro hair, nor would they be approved by our society. So I ask you. are blond jokes racist?