School is real, too, and lots of graphic design and publishing people use Macs. Not everyone is going to be a publisher. It's called the Internet. Everyone is a publisher. But training students on Windows gets them ready for what they'll use on the job.
Macs are easier for a user to assemble into a network.
AppleTalk is chatty and eats up bandwidth on my network. Macs haven't changed in 16 years. Macs have had one fundamental change, to OS X, in 16 years. For each situation, one of these points might be the deciding factor. You're here, you're reading this article, and we can guess which side of the fence you're on.