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It's not really that complicated. Losers who spend too much time on the internet tend to both like anime and not have a gf. Also, like everything, it's easy to make anime about hating women.
If you want to link any two internet-life phenomena this is usually the answer. It's like that Norm bit about suicide. "People always say they don't understand. Really? You didn't catch the part where life is pointless misery and the world is cruel and uncaring?"
