To this, I have several things to say. Annoying people quickly looses it's entertainment value when no one listens, and raises a fuss. The internet never truely had any central authority to control its content, or the activities of it's users. In it anarchy in practise and the internet community as a whole handles any users that may get out of line, That means that YOU as users have the power to control the content you see.
Kill files exist in most news readers that are available on the net.
Check the manual or online documentation for your particular newsreader to discover how to confiure and use it's kill file feature. If your newsreader does not have this capability, then find one that does. There are enough different programs out there, you should have no problems in finding one that provides the features you require. For those using tin as their newsreader, this is a simple proceedure. This proceedure can also be done based on the subject line as well.