You know, some people might say your bitter little animosity over whatever perceived slights you feel you’ve suffered might is concerning. Not me though - I get a warm fuzzy sense of superiority just knowing that there’s people like you out there who can be fucked with so easily.
Anyway, here’s a little experiment for you. Go to your zoo on a good summers day, and watch the counter staff. Now go to a popular bar on a friday night and watch the bar staff. I appreciate being out in a bar on a friday night might be a shockingly new experience for you, but honestly getting out a bit more could be a good idea in itself.
But back to the experiment. Now I’ll admit that my experience is a bit skewed, as I’ve been to a few more bars than zoos, but even so I’d wager decent money that a bar on a busy night is way more hard work on its counter staff than, for example, manning the ticket counter at a zoo. I’d even bet that was true for a busy McD’s at lunchtime. For example, I note that a busy McDonalds branch will serve up to 30000 customers a day. I’d be surprised if there’s many zoos that beat that figure. I’d be surprised if there’s many post offices that could come close.
Finally, I’ve got to say how much I’m enjoying the your strange rage that customers should want to be served in a timely manner. For some reason, you feel this makes them “entitled assholes” or “oblivious fucks”. Really, I think you might want to consider whether working with customers is your natural calling. Have you considered something that might be more suited to your strengths and temperament? You hate customers, and despise all interaction with them - have you considered technical support?