They're all as bad as each other. Here you have mad posters claiming the Mighty Mouse is the best thing since sliced bread, that nobody needs Bluray because it's a distraction from creative tasks, that a game isn't a game unless it is native to OSX.
But on the Windows side you have people who think OSX is a FisherPrice OS, that Macs are weak and overpriced (in some respects they are but I couldn't find a laptop as all-round brilliant as the MacBook in that price range, no multitouch, not as quiet, not as good display).
They're all ridiculous. The only problem with Mac fanboys is that they're smug, elitist and ignorant. A PC fanboy is mostly just ignorant.