Do people sometimes use the troll moniker to dismiss another person's postings simply because they don't like what that person says?
http://en.wikipedia.org/wiki/Internet_trolls
In Internet terminology, a troll is someone who comes into an established community such as an online discussion forum, and posts inflammatory, rude or offensive messages
designed to intentionally annoy and antagonize the existing members or disrupt the flow of discussion as their only purpose (see Anonymous Internet posting).