The core reason of why I hate Macintosh (or rather dislike Macintosh) is a rather interesting reason. And if this comment turns this flame-war into a a holocaust, I'll eject and be done with it!
I dislike Macintosh because 90% of every Mac-user I've ever met in my entire life act like Macintosh computers are the GODSEND to the computing world. They bash PCs to the point of absurdity and act like their Mac was forged by the Hand of God. It happens all the time. I realize that a lot of PC users are like that too, but I generally keep an optimistic perspective on Macs. I don't bash Macs unless the evangelists start, well, evangelizing about how good their Mac is and how bad my PC is. I mean, if you like Macs, and you need what a Mac offers, good. If you like PCs, and you need what a PC offers, good! But please, for the love of God, stop being so defensive.
This goes for you PC users too who constantly bash Macintosh