Atwood is a dyed in the wool Windows / .Net evangelist. Nobody should be terribly shocked when he makes the assertion that anything other than Windows & .Net are substandard platforms.
"I take issue with David's claim that, when it comes to computers and operating systems, there's any "best" anything. In my considered opinion, they all suck. Sure, there are tradeoffs, pros and cons, strengths and weaknesses. But an objective best? It's all relative."
"Don't waste time arguing about the character select screen. Results speak loudest. Show the world what you can do in your programming environment of choice."
Hardly sounds like he's bashing non-Windows. More like bashing elitism and OS-ism.