I usually expect people to forget my birthday, mostly because I don't make a big fuzz out of it. Its not because its not an important day for me, but simply because I prefer to celebrate quietly. If that makes me antisocial, so be it.
To those who remembered, THANKS!!!
To those who failed to greet me, its okay. I don't mind. 
But to those whom I expected to remember but didn't (especially Jon D.R.).... Grrrrrrr!!! 