Hmm.. Humor's a special thing. I actually like those. They insult the user (me) for doing something stupid or wrong. Classy? Probably not. But fair game in my world.
"Hey, see this nice smtpd we created? Here's how you blacklist the domain of a Linux guy we like to make fun of/blame for everything wrong in the world" is .. childish. But again, sense of humor is certainly something that is open for interpretation and all..