Linux users feel superior because
a) They generally hate Microsoft because they produce bug filled software
b) They need to know a lot more about computing to run a Linux operating system properly.
Mac users should just feel ashamed. Only kidding! I use a PC, I've never really been into the Mac ethos, but it is a good system to use for specific tasks, especially music editing and graphics.
I use a PC with Windows and Linux, simply because everyone makes software for Windows. You'd feel a bit inferior if you couldn't run 90% of all software.