1. Ad hominem isn't really a good argument for ignoring a poorly composed post.
2. If you think that avg karma is a good metric for measuring the usefulness of a comment, you might be confused about confirmation bias...
1. The argument isn't to ignore the comment because the author is dumb. The argument is to ignore the comment because the comment is dumb, prima facie. That is, a reasonable person who has thought about the issues at hand would easily conclude that the comment is not the product of serious effort or consideration.
Backpedaling when it's plain to see that you called him a dumbass doesn't work. You didn't attack his comment, you attacked his history of posts, using a flawed metric.
