I had long wished for an "ignore" function where if you didn't want to read posts from people, you could just put them on an ignore list. Much to my surprise and satisfaction, I just discovered this feature tonight. Click on the profile of the person you wish to ignore, then on the right, you will see a link that says, "add this person to your ignore list", or something similar.
Once they are on your ignore list, you will see their name in the thread, but the message contains a line that says, "this post is hidden because this user is on your ignore list". I think this is a GREAT tool to use for ignoring the trolls. After all, you can't respond to their crap if you don't know what they posted.