I like to greet people on their birthdays. I used to call them, sometimes at 12 am, just to start their day with a smile. Then someone told me, "Don't do this, especially with boys. They will think you have a crush on them."
Well, I only did this with my friends, colleagues, and family, and later I heard some of them say I had something on my mind, which is why I called them. Some said, I have an interest in them.
I surprised. Maybe I am not born for this world. Anyway, I stopped myself. It's true, I feel great when anyone says Happy Birthday, give me gifts. But I better not do this with others, because, they took it wrong, sometimes.
So, yeah, I don't say, but I wish everyone a Happy Birthday.
Nowadays, I send birthday messages on their FB Messenger. Who likes, replies; who doesn't, doesn't answer. I understood, from next don't send them any more messages.