I'm not sure if many people who buy a Dell, HP, Lenovo, Acer, or other Windows computer maker brand are very loyal to their computer maker brand compared to Apple buyers where if you want to use the Apple operating system, you need to buy a Macbook, iMac, or Mac Pro which are all made by Apple.
I mainly buy the Windows computer with the fastest computer parts for an affordable price. I used 1 MSI computer, and one HP desktop computer, and the main reason I got them was because they had good computer parts for the price which was about 400 dollars or less, and they still work well these days.
I see people and designers like web designers, programmers, video editors, musicians, and other content creators use Macs as well.
My elementary, High School, and other schools have Macs, so I think not as many places are Windows-Only these days.
If you count the Apple iPad and iPad Mini as an Apple computer/tablet, there is a large group of people who use Mac as well since the Apple iPad is the best selling tablet computers in the world.
Mac users, much like iUsers, just have big mouths that they cant keep shut about their choice of an o/s or device.. they are sort of like the WBC of the tech world that way.. and while other types of users have become overzealous regarding their choices as well, I've seen iUsers take their devotion to a whole new and disturbing level both on and off the net.