Yep, until a strong enough AI exists to discern the useful information out of the flaming.

The problem with people who you'd want to block is that a good amount of the time they say something that gets you to think things through in a different light. It sucks to get flamed, but boy is it a good tool to force a reassessment of what you've said. Sometimes you realize you were dead right, and sometimes you realize the guy you want to block has a good point.