Why have we women been stereotyped by our hair color?

I heard some blonde jokes on TV tonight. Why is it that we women have been stereotyped by our hair color. A brunette is sophisticated, a blonde is ditzy, a red head has a temper. I have a question though. Why are guys not stereotyped by their hair colors. I mean for example would a red headed guy have a worse temper? Is a blonde guy's IQ going to drop? I guess it is a double standard and blonde jokes still exist and everybody thinks they are funny. Where did this stereotyping women based on hair colors of the past come from? Why was it done? I don't know. I know that we tend to color our hair more than guys, but some guys these days will add color. Feel free to elaborate as to where this stereotyping comes from. I assume from the past, but why did it start? Who started it. I really don't know, but am curious.

Why have we women been stereotyped by our hair color?
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