I think the only people who can comment on this are those who have both a PC and a Mac. Or at least good personal experience of both.
I was lucky enough (well, worked and saved hard enough) to have a MacBook Pro land under my tree at Christmas time and due to a long delay on a graphics card in RMA, I had plenty of time to get to know my laptop.
Whilst I wouldn't be the most "setting-happy" person on computers, I suppose I 'know enough' to satisfy what I need doing.
Physically, Apple simply have the best design team in the world. I think anyone who argues different is looking at an E-Mac rather than an I-Mac and an original iBook rather than a MacBook or a MacBook Pro. Their thinking behind their design is just beautiful, they make beautiful products.
Look at any iPod relative to its release dates, cutting edge, inside and out.
Now, like everything else, music, cars, football, and so on - that may not be your thing and I think that's fair. The diluted, near bleach white look isn't for everyone, but then what is? Someone in PC land will think a £15 gamers case off the bay is better than a nice, tidy Lian-Li PC7 from OverClockers. (discount, please)
After opening my MacBook Pro - the use of colours and layout were just fantastic. After less than a week of using the MacBook Pro, I had already drawn up a plot on how to sell my PC and buy an 20" I-Mac for my room instead. Thankfully I didn't go through with it (given hindsight) but it definitely had a great effect on me. I just found it a really nice platform for which to 'compute'...
I had used an E-Mac with Mac OS X in college before, but that was usually the object of my hatred. What a piece of crap, I thought. Not surprising given how it was a PowerPC Processor 1.25Ghz with 1GB of RAM. Yet, I still thought it handled some things efficiently for what was under the hood. Unfortunately not even that spec can perform in Motion and FinalCutPro/SoundTrackPro like our tutors are expecting it too. But that was my first true experience of a Mac.
Even furtherback, my first computer was a Macintosh. It was one of them ancient ones without real colour on the screen. I had been given a three hour lesson (by my Uncle and Dad, well, my Dad isn't computer minded, he would occasionally nod knowingly to what my uncle had said) on how to use the machine - then when I was set free on it, I started dragging every program into the recycle bin, believing that when I had dragged every program into the bin, the last remaining one would start up - or at least that was my theory...That was, many moons ago.
I don't see any harm in the advertisements. It was interesting that when I didn't have a Mac, I found them quite annoying and now I don't really mind them - whether I have been brainwashed or not by Spotlight and Widgets, I don't know - but I think it's safe to say that Apple aren't really as bad as people would like to make out.
They're playing catch up with Microsoft and a bit of what I see as banter in their advertisements isn't going to do anyone, any harm. If the new computer user is someone who is going to be swayed by one or two advertisements, who isn't going to be someone who seeks advise from a relative or even a computer magazine for their first purchase - then let them be taken in by the 'cool' bias of a Justin Long, in the Apple advertisment, the 'WOW' on the billboard advertising Vista.
It could be argued that Vista doesn't have a 'WOW', when your components don't even have drivers (Maybe not Microsoft's fault, but it's still restrictive) and that Apple Mac computers have never been cool.
As for what drives people to hate the other 'brand', it's just old stereotypes. The Mac User is someone who doesn't know much about a computer at all, but who is arrogant enough to tell you how good their machine is and the PC user is someone without taste or sense in regards to what is a great operating system. Getting along is ideal, but it'll never happen. And as much as I hate the bickering, yapping and winging that occurs between the two sets of 'fanboys' - I'm happy enough to sit on the fence and enjoy the best of both worlds.
In terms of the computing industry especially, I think it's great that there can be two sets of what are all normal computer users, being so unbelievably different.