Most of them are. I can not possibly count the amount of times I had discussions where Mac users were touting how much more stable OS8 was over NT4 and then OS9 over Win2K- the mere assertion is laughable at best. Neither of them could hope to compete with Win98, for that matter Win95 was their superior in terms of stability when pushed. Constantly they talked about the superior multi-tasking and memory management(along with numerous other elements, I simply remember those as pre OSX was closer to Win3.1 then any Win9x based OS in those aspects, let alone Win2K).
Hey, I can't help it if your Mac acquaintances are idiots.
Seriously, back in the OS 9 days I used to make fun of the instability of Mac OS. The response to me was never that OS 9 was more stable than Win 2000, because they knew full well it wasn't. They still preferred their OS 9 machines (and gave me a bunch of reasons why, which I didn't buy), but few claimed OS 9 was stable with a straight face. But that's just the people I knew.
Then there is the insistance that Macs are much faster because they can run a couple of Photoshop benches quicker then a PC. That particular claim is repeated by Apple themselves and not that long ago they were forced to pull ads they were running because of the misleading nature of them(which, most ads being misleading by nature speaks volumes).
The ads were pulled in the UK I believe. Interestingly, for Photoshop, the Macs are often indeed faster, mainly because it's the commonly used ones that are faster on the Mac (incl. stuff like RGB --> CMYK), but much of the time, the speed differences are irrelevant, and with different Photoshop work, Windows PCs will be faster.
For other stuff, it depends on the software. If it's integer heavy, the x86 machines usually win though.
Then there is the whole 'you get what you pay for' mentality. Apple can slap any obscene price on a machine they want and a great deal of the Mac faithful rally behind it with fanatacism stating that the reason you have to pay more is because of how much better the hardware is. If you are thinking you disagree with this point honestly contemplate if Dell was selling a rig that ran OSX comparable to their typical current machines and Apple had their current lineup would you even consider buying an Apple machine?
After I bought my TiBook, my boss wanted something similar, but in a PC laptop. The closest thing I could find was an IBM T series, but it cost more than the TiBook. By the way, I can't stand Dell laptops. I had an Inspiron, and it was not so well built. My colleagues have them too, and they seem better than before, but still not even close to the level of the IBM T series.
And it's basically impossible to buy a Windows laptop with the same feature set of the iBook G4, for the same price.
Mac users also go off about how everyone in the content creation worl relies on Macs and their are no substitutes(we can even see a bit of that in this thread). I recall talking to numerous delusional souls who were blinded by their faith that were utterly convinced that all high end CGI was done on Macs- this was some time prior to Maya even being available for the platform(even if it tends to be an outdated version, at least they have something better then Lightwave now).
Again, everyone I know knows that most 3D isn't done on Macs. There is more of it done nowadays than before, but it's still a drop in the bucket comparison.
However, a lot of content creation is still done on Macs. Computer market share is about 2% Mac these days overall, but in stuff like broadcast video, it's more like 25%. So it's not insignificant obviously, but it's not the majority.
Yes, I stand by my statement that most Mac users are either delusional or liars. I haven't said it's all of them as their are certainly reasonable enthusiasts who can openly discsuss the ups and downs of the platform, but they are certainly not the majority.
And I still wonder just who you're talking to. Anyone with significant experience with both sides will tell you that both have their advantages and disadvantages, even if they have a bias towards one or the other.