My post master works hard to keep things running and has never been rude about chicks. They call me to come in at 6:30 am as soon as the truck arrives.. most often. And one shipment I sent to the SF bay area.. the worker called around 4 and said they would be there late and allowed the receiving person to pick up hatching eggs at 7:30 pm!I know the post office hates dealing with chicks. I think they actually shake the boxes sometimes to harm the chicks so we dont order again. The old postmaster used to bitch at me for ordering chicks and ask questions like... "how many times a year do you need to order chicks?" Or, "Can you please come pick up your noisy chicks?" They keep them in the air conditioned room and if they decide to deliver them the constant stop and go driving involved with postal delivery is ridiculously dangerous for day old chicks. I always instruct that I pick up my birds at the office. Definitely the best way. Postal workers are dumb as a stump about chicks....
As an avid breeder/hatcher.. it doesn't take some Stew Pidasso shaking a box to harm chicks and quite frankly HATE that when ONE does something it makes ALL guilty by association. I thought stereotyping was dead!? Anyways, I'm sorry your postmaster comes off that way. Most people just don't like thinking the chicks are cold or hungry.. and the same question asked in different tone of voice carries different meaning.. I like to presume that I have NO CLUE what another person may be facing daily.. and NOT take things personal.. more often than not.. it has nothing to do with me. It's never about what's said but how we perceive it that counts. And what more.. If I know of a person who's always hohum about our interaction.. watch me kill them with kindness. It's not about what happens that dictates your results in life.. It's very much about how you react to what happens that determines the outcome! I can't control others but I hope to impact them positively!

In previous years I did receive some bantam shipments that were either DOA (25) or half DOA. This year my shipments have been pretty good.. Most recently from Meyer.. only 6 chicks hatched/shipped Monday and arrived Thursday morning. ALL are still thriving. I also had good shipments this year from Cackle, Greenfire, and Ideal.
Please note that the hatcheries and the post office are still doing their best during this pandemic and have truly done a great job adapting. My personal shipping speed is the same as before the pandemic..
Besides.. keep up the bashing of USPS.. and see how much longer they will even transport livestock for us! They are the ONLY one's who are doing us that courtesy.. Let's show them some Love and appreciation instead of acting like postal workers are the enemy sleeper cell.
Consider educating the person asking questions about your orders instead of feeling defensive. And EVEN if the individual's intent is pure ugliness.. don't give them the power to steal your JOY also. SHOW them the glory of chicken math!

ETA: The hatcheries look at the weather reports and determine their minimums, to include a heat pack or not, and how many holes to punch open for ventilation depending on their destination and the EXPECTED weather conditions. Things can change at any time.. but they do their best to get us LIVE chicks.