I expect it has a lot to do with which blogs/forums you're reading.
In my experience, the number of Apple fanboi comments vastly exceeds the number of Android fanboi comments, pretty much everywhere I've noticed.
Given that the iphone is very, very, popular, especially in English-speaking countries (and I mostly read blogs in English), this isn't entirely surprising: popularity, especially mass-market popularity, almost always comes with an associated fanboi/mouth-breather contingent...
[Actually, I'm not sure I've ever actually seen a real Android fanboi; most comments I see criticizing Apple seem to be pretty purely anti-Apple, not pro-Android per-se. AFAICT, Android is thought of as "the practical alternative," and doesn't tend to engender passion (including the sort of degenerate passion fanbois represent) the way Apple does...]