Here's my honest opinion. Please don't think I'm trying to be a beyotch.
I am not on any social networking sites. But as I understand it, FB friends are permitted to comment on your page thingy? If people are going to put themselves, their opinions, their lives, and personal views and details out there in cyberspace, some people might respond in ways that might be annoying.
I guess if you don't like their mocking comments, can't you de-friend them?
I realize I'm not much help because as I said, I am not a facebook, myspace, twitter kind of person. I won't even pretend to know the etiquette on those kinds of sites, but mocking comments seems to be the accepted norm on the internet, no?