The Ignore Option. Please use it.
Go to "Settings" located at the top,
Scroll to third tab on the left of the screen under "My Settings."
Scroll to sub-heading, "My Account."
Click on 4th link, "Edit Ignore List."
Enter screen name of member you would like to ignore.
Another way is to simply go to that member's page:
Underneath their profile picture, or the area where their profile picture should be, the third option is "Add to Ignore List." Simply click on that.
Just in case someone needed to know where it's located and how to do it. Unfortunately, you can't ignore Moderators. Or maybe you can.
Another recommendation if you don't want to use the feature is to simply stop responding to that member's post, blogs, or photos. They are continuously posting because you're continuously responding to their post. That is all.