My postman doesn't mind me (as far as I'm aware), it's my local post office that hates me. It's a tiny, smallest of the three in the small town in which I live, two counters and only one is ever open, tiny Post Office. So when I turn up with two carrier bags full of parcels that each need to be weighed, tested to see if they fit through the little 'pretend' post slot that determines if I need to pay a bit extra, crammed through the gap in the window because the staff can't be bothered walking three feet to the bigger parcel window, you can almost literally see the hate in their eyes.
It's getting more and more difficult to resist shouting "YOU WORK IN A POST OFFICE. QUITE OFTEN, PEOPLE WILL LIKE TO POST THINGS. THAT IS WHY YOU GET PAID. DO YOU UNDERSTAND THIS?"