In the profile field you can have friends and foes if you dislike someone here on CT simply add them to your foes list and you wont have to see their post in the forums.
You can also add people as a friend and the person you add has to go to the friends and foes and add you adding someone as a friend won't change anything it'll just be normal and have them listed as your friend in your profile.

It would be nice if you could mute someone in chatbox, so you don't have to listen to them.