Most Helpful Girl
those comments weren't made to hate on blondes, ther were made to hate on women :p
this type of insult starting forming when blond hair became really popular-- so women would dye their hair blond and some people claimed that the chemicals would go to your head and make you stupid. it didn't help that the popular personality type, and favorable one of society, at the time was a proper, but rather stupid woman who is very girly. you know, the dress, the vacuum, the pot, pan, and apron.
Back then, it wasn't very hot to be very intelligent :p and what made you intelligent was listening to your husband.
so that insult just sort of.. grew to encompass all blondes and then to all people.You can accuse anyone of being a "blonde."