I find the campaign amusing if nothing else. However, the average PC user does not have a choice when they buy a computer. It comes pre-installed with Windows.Yeah, I've always felt the best way to switch a non-Mac user is to show them what's so nice about using a Mac, not belittle their current choice of operating system.
Take a quick survey and a PC user (not a Mac user) if they choose their OS. A majority would say "no" that it just came with their computer.
Granted, people who buy Macs really don't have a choice either, however a majority buy a Mac because they like the OS (and they will tell you so).