Smugness - the most irritating part of the zealotry. Any straight out lie can be carried out elegantly with the right amount of smugness.
VST support - I am warming to Apple's approach that they darn well wrote the OS, so they are going to darn well write the audio plugin standard too. Forget everything you know, get Logic Studio and see how well plugins can be handled. If a plugin writer won't write an AU version of your favourite thing, they probably aren't writing good quality code either. Too much bedroom code and free VST's out there in the PC world. Also forget WAV files because you can only use it on a Mac so might as well go for AIFF
Personally, my income comes from using PC's and fixing problems caused by humans on PCs. In fact I never see or use another's computer if it doesn't have a problem. So I would rather have a Mac to persue my hobby thank you.
B