First of all, I think the use of BSoD is just a metaphor for buginess. Second of all, I don't believe any MS fanboys who claim that Win2k/XP simply never crashes. Just because it (doubtfully) never happened to you doesn't mean it hasn't happened to the millions of other people who claim it has.

You are not a superhero system admin who has some magical ability to keep any computer you come in contact with completely crash/error free.