Some people perceive blondes as narrow-minded women. The myth about nonsense of fair-haired women is obliged by the origin to many factors.
Sexy beauty
Actresses blondes created images of narrow-minded sexy beauties, and fans of cinema wrote down style and behavior of heroines. As a result the stereotype of the blond gentle, but foolish girl who does not wish to think seriously of life at all was formed and to solve some complex problems. All her thoughts are easy and weightless.
In some movies or books there is an opposition of the narrow-minded blonde to the intellectual brunette. To create effective contrast, the nonsense of owners of a fair hair is exaggerated considerably.
Perhaps, the film image got into masses.
Victim of fashion
Separately it is necessary to mark out not natural, but colored blondes. The girl's time which absorb any fashionable trend with ease refuse the natural appearance and clarify hair to please to fashion and men. In parallel these ladies put brightly on and painted, behave coquettishly, generally, try in all ways to draw attention by means of own appearance. Perhaps, because of such women blond it is considered to be not too clever.
Sometimes bright, colored blondes behave provocatively and show not personal qualities, but own delights.
Protective reaction
Are lost by a time of the man before beautiful women. Sometimes they are refused from smart girls and in revenge think out myths about their nonsense. Perhaps, blondes got to a rank of narrow-minded women just because young people wanted to be protected from their shattering seducement somehow. Perhaps, myths about blondes were thought up by men who wanted to ego-trip somehow against the background of silly women. Anekodota and familiar expressions about what blond girls stupid and not adapted for life can warm soul of guys with complexes. It is possible that women whose only weapon is the intelligence laid hands to development of opinion on blondes as about narrow-minded girls. From disappointment on others beauty, brightness, appeal and sexuality "the gray mice" thought up such way to revenge and belittle blondes.