I recline. I don’t mind if others recline in front of me. I don’t care if others behind me care if I recline my seat. I paid for the seat, it declines, I’m going to recline the mofo if I please.
That said, if the person seated behind me really had a problem with me reclining, they would get much better results talking to me like a grown up than punching the back of my head rest.