I have done nothing, that I can think of, to aggravate the postman. And sure, my package sending is unusual, but it can't be the weirdest thing he's ever seen mailed. That does not stop him from arguing with me every time I'm in there trying to mail something.
Once it was Constantine's birthday package. He refused to sell me a box. Told me that it wasn't worth buying a box to send a gift and that he would "make" one by retrofitting a piece of cardboard. I said I would prefer making it easy on everyone and just buying a box. But no! He cut and folded and taped and smooshed until what Constantine received looked like a present that had spent some time in the blender.
Another time it was oopsalittle's hat. I had filled out the forms to send it out of the US, even saying that it was a knitted hat. He asked if it was really a knitted hat. I answered yes. Then he said "So I'm correct in thinking that it has a value of $0?" Sure, dude, whatever gets it mailed. Looking into my eyes he asks "why would you mail something that is worth nothing?"
Yesterday it was because I didn't put a return address on one of the packages. Also I had two different return addresses on two different packages. I was merely mailing something for someone else. Then he gets started with "Your name isn't really Believe. What are you trying to hide?"
I am waiting to walk in and see my picture on the post office wall.