What? A Mac is a PC.
I'm so old I still think of a PC as a personal computer. A Mac is a personal computer. Somewhere along the line the term IBM-PC or IBM-Clone lost the IBM and the clone part to become just PC. Lately the term PC seems to refer to Wintel boxes. I run Linux on an AMD64 but consider it a PC.
The Mac people started the fight. I have encountered many smug Mac users. It seemed to reach its height around the time Windows 95 was current. Win95 was not the best OS I've ever used and it was not very stable. The Mac users really had legitimate criticisms. Crticisms often used, I think, to cover some envy that they couldn't play some of the coolest games. (Gaming is another reason why Wintel did so well in the home.)
I found that running Linux on my PC stopped many MAC arguments. They'd say PCs are not stable like MACs. I'd say that's a Windows issue my PC with Linux is stable as a rock. I had one friend who refused to believe that my brand new PC could encode an MP3 faster than his five year old MAC. I tried to explain that in the last five years PC speeds were way up and I just plain had more processing power. He never really got it. I think he figured a RISC chip was always going to be better than a CISC chip. When Apple adopted the x86 Intel I had a good laugh.
I find now that it seems to be MS Win users that are smug. 'We are the most popular' ergo the best, is what I keep hearing.
Personally I think that technically MS Windows is the worst desktop OS available today. But it is popular and there is lots of software so it is impossible to escape. (Yet

)
Me. I use WinXP at work. I use WinXP to play games on at home. I use Linux for my own personal computing. I'd buy a MAC in a minute if I thought I really needed one. I'd like one, actually. I really just like computers.
One more thing. If PCs are so easily upgraded why do I have six of them? They are easy to upgrade while still current but when they get a few years old upgrading can be near impossible. The most common PC upgrade is a whole new box.