It never happened to me...but it did to a friend, and let's just say it wasn't a nice thing to see, despite what he said was just a fair critic over the game, as it was essentially pre-HW and it was a concern of how the MSQ was quite a huge lock for new players. The backlash he received was so huge that he got harassed in-game (or so he says), he got perma-banned from the forums (or so he says), and despite all that he kept playing the game since he was a big lover of FFXI. Way to go...

On my behalf, thanks to that experience my friend had I used for an alt's icon for the longest time to avoid being recongnize...but now I don't care anymore: if someone gets me there because of my "blasphemic" posts I'll just blacklist and report them.
My patience is too little at this point.