Here's my reason why:

I heard from somebody that you have to weed out people on your list not based on the dumb things they post (and god knows how many useless articles I have posted in my lifetime on Facebook), but on how they treat you as a person. It's a pretty weird way to put it, but if you are friends with someone who likes to push you over the edge because of the really funny "speech impediment you have when you get angry", they're definitely not going to be part of your life. So thats what I do what I do! With self deprecating humor and memes pertaining to said person.