I absolutely hate my post office. Mail never shows up, it's not put in the box sometimes when it does show up, packages look like they've been thrown down a flight of stairs, letters arrive torn, etc, and the workers there have this classic attitude of "I work for the feds and will get paid for doing nothing or doing something, and, so, I choose to do nothing." There's no pride in the work anymore. The days of the personnel actually caring are over.
Now, I'm sure there are those who will disagree. I'm just posting about my personal experiences - not anyone else's.
Sorry you had to go through that. To be quite honest, I think the crowd in line behind me would've gotten an earful if that had been me. I would've lost it, to put it nicely.