It's a bit of a craze to mock things, we like to be pack animals feasting on the fresh carcus afterall. Just search Nickleback on Reddit.

However it's bizzarely useful in a way. Say you've got a trail version of an application, you can have a penalty of users who run the app for more than a month without a purchase. Simply flick the font in to Comic Sans. You gain geek credit, even some free blog advertising under the Comic Sans lol bandwagon.

That then creates more posative feedback, people like to read things they are already vaugely familiar with, so you get that natural circle of hate.