If, for whatever reason, someone gave you a negative reputation hit and left a rude, threatening, or inflammatory comment, just contact any moderator. Those can be removed, and the one who left the comment can be dealt with.
Well, I had to remove one from 1963_Trucker, but he was no good anyway. Some people here may just want to start trouble, and use the rep system to do that. I just thought I'd let people know that if someone did do this to them, it can be removed.