Interesting question. I don’t think I have experienced a fluther post where that happened. In general, I’ve seen some blatant Windows fanboyism throughout the interwebs, but it is usually in response to Mac fanboyism (at least on the places I visit). For some reason, fanboyism is stronger in Mac users. I think it is some combination of niche market, minority market share, emphasis on style, usability, and customer service.
I think most people use Windows because it is the market leader, Windows machines cost less, and it is what they are used to.
I’m with @Sarcasm, my windows machines don’t crash or get viruses either