>
Well let them post what they like to post. They do not harm others anyway. >

I went the opposite and delisted mine from fb >

I hate the "Keep calm, it's my birthday" posts.
I defriend anyone who does that. Unless they are family or close friends. >

You gotta look at things from their POV. While it may seem a bit weird, the people posting are doing it because they want people in their circle to acknowledge it on that day.  
A lot of people(especially older) don’t get enough people wishing them in real life. >

Yeah, the elderly definitely get a pass.