I think that there should be an ability to block people from seeing what you post and from you from seeing what they post.
Some people are a little annoying and do not know when to just shut up, it would make things alot simpler if you could just block or mute people or something.

that would be just stupid cause you need to reply- you should be able to block pms from him

in your brilliant idea if i block the mods i can say what i want about them

if you ask them to put you on their enemy list, that will do the trick, you can find the lists on the user control panel.