I'm going to wait to wish someone a happy birthday until after their birthday has passed.
Why don't you want to wish them happy birthday now?
Because I'm too lazy to do it right now.
While it would be better to wish them a happy birthday right away in case you forget, as long as you wish them a happy birthday it is a good thing. They will appreciate that you care about them.
Haha, it's fine if they don't care. I'll wish them happy birthday tomorrow.
Birthday wishes aren't that big a deal, although it's nice to do. But I'm a little more worried that you seem to take joy in being rude to your friend. You shouldn't go out of your  way to be mean to someone.