I think you've hit the nail on the head here. People like to feel part of a collective group, and the Internet's biggest collective group is outraged people. In

I think you've hit the nail on the head here. People like to feel part of a collective group, and the Internet's biggest collective group is outraged people. In this case, outraged nerds. We collectively 'agree' that outsiders (that is, idiots) use Comic Sans. Then we attack the style, rather than the substance, because they didn't know of the unwritten rules of our subculture.