Yes, Macs, iPhones and iPads are tech gadgets, and you'll find a lot of people here who like technology. You'll therefore get advertisers who target certain general categories of sites, not just by keywords in a thread. It makes more sense for Android ads to try and woo users who are currently not using their products rather than say, preaching to the choir on an Android forum.
Apple spent $17.9 Million dollars on Google Adwords in 2011, and I guarantee you they weren't just targeting sites that catered to the Mac crowd.
The fact that anyone is getting bent out of shape over how companies are targeting their Google ads is a joke IMNSHO.
I don't control that. I can block advertisers, but even I'm not a big enough Mac fan boi to block advertisers just because they're "the enemy"