I don't really know when the backlash started, but I can assume it was around the "Gingervitis" episode of South Park when it started to pick up some momentum. 

Well, what started as a throwaway joke seems to have turned into a phenomenon that has precipitated a little bit of genetic cleansing (which never ends well). Cryos International, the world's largest sperm bank, has stopped accepting deposits from red-headed sperm donors. In their words, "there are too many redheads in relation to demand. Our stock is about to explode." 

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Besides the unpleasant visual image of thousands of jars of exploding sperm, the sperm bank seems to be saying, "Thanks, but we have more than enough redhead specimens right now. Nobody really wants them right now." They've got an inventory to manage, and if ginger kids aren't in demand, they can probably scale back or stop entirely their procurement efforts. It's not like they're burning the samples they do have. 

Lest you think that the company is part of some sinister scheme to create some Aryan master race, the company says that ginger sperm is still moving very well in Ireland. "Like hotcakes," as the company unfortunately put it. Great. You just ruined pancakes for me. Further, Black, Asian, and "Mediterranean" samples seem to be in the highest demand. 

Well, between this, the natural selection processes of things like this, it's no wonder that the number of gingers are dwindling. For every Angie Everheart and Emma Stone, there's a Ron Weasley and Carrot Top to keep holding the redheads back.