Culturally speaking why do people think blacks have to have black hair?

I just read a question and this guy said blacks can't have other color hair but black..we can have blonde(very very rare),red, and brown..In fact my sister and cousin has red hair and it's not dyed we can have blue eye's... show more I just read a question and this guy said blacks can't have other color hair but black..we can have blonde(very very rare),red, and brown..In fact my sister and cousin has red hair and it's not dyed
we can have blue eye's also

http://rpmedia.ask.com/ts?u=/wikipedia/commons/thumb/d/da/Vanuatu_blonde.jpg/140px-Vanuatu_blonde.jpg

http://rpmedia.ask.com/ts?u=/wikipedia/commons/thumb/d/da/Vanuatu_blonde.jpg/140px-Vanuatu_blonde.jpg

http://www.author-me.com/images/clip_image004_0001.jpg

http://joeljamescomedy.com/wp-content/uploads/2009/12/blackbabyblueeyes3.jpg
Update: I said blonde hair and blue eye's are not red hair and brown hair
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