I am, mostly because it's wrong and helps in perpetuating misconceptions. I use a PC with Linux, you can use a Mac with Windows or Linux (and others), and nowadays Macs are PCs with a prettier design, so saying "PC and Mac" is completely meaningless. It's like saying "Mobile phones" when it only works in Android. You then have to take the time to explain to normal users why it doesn't work in their iPhones or Blackberries.

I would expect better from Google.