Many newsreaders allow you to “killfile” a particular poster so that you never have to look at his or her posts. If you are using a unix command-line newsreader, see: Kill file, Giwer Matt
The quick answer is to access your KILL file with control-K, and add this line:
If you are using a Mac to read news, we recommend “Yet Another Newswatcher,” which supports killfiles. See: http://hyperarchive.lcs.mit.edu/cgi-bin/NewSearch?key?key=yet+another+news Page does not exist
If you are using a Windows machine to read news, we don’t have any tips at the moment — stop by later, we’re working on it.