In my opinion, anyone who uses a mac for anything other than design work or multimedia creation has wasted their money and probably bought it so they could act all smug and brag to their friends that "I use a mac."
These people need to be beaten severely with a mini USB cable, then forced to justify in detail why they HAD to buy a mac, other than the fact that they're a douche with a huge ego.
Its kind of like when you see some jerk off riding a $4,000 carbon fibre, full suspension downhill racing bike on the fucking sidewalk. I mean sure if you can afford it that's great, but WHY?!? Other than to show off how much money they spent, and really, when are they EVER going to use it for its intended purpose?!? The $1200.00 downhill body armor and helmet just add to the whole doucheitude, kind of like people buying a new desk because "It matches my mac"
What can a mac do that a PC can't? Not very much, its just a more stable system.
Why the hell would anyone spend 3+ grand for a mac when all they're going to use it for is surfing the net, checking eMails and playing games? You can buy a PC and upgrade the living shit out of it for half that price! (That's right, because they're a douche and need to show off)
I use a mac for work, and a PC for play. The difference being that macs were designed to be powerful, dedicated graphics machines with little or no worries about viruses, etc. and despite what they advertise, they're really meant for professionals. Also, Adobe products run better on macs, because that's the platform they were originally intended for.
I use mac OS-X and have no intention of partitioning and installing windows. In fact as soon as I can I'm switching to google's OS because I sincerely HATE Microsoft products. I use Windows XP on my PC and it STILL is constantly downloading security updates, etc.
What a joke.
So to summarize, Mac users: Either professional designers or douchebags with more money than common sense, or someone who just plain likes macs for their superior graphics in watching movies and stuff, or had one bought for them and doesn't brag about it. (I know you're out there)
PC users: Pretty much everybody else.