I came to this post office with a few questions about mailing items I'm selling online. I was literally the only one in line at noon and the man who called me up to the counter seemed very annoyed I had questions. He told me to go look on the website and when I told him I did but I still had a few questions he sighed. He then said it was stupid for me to use cardboard envelopes and told me to use paper envelopes. I told him I'm selling these items so they can't get bent in the mail and he sighed again.
If you are so unhappy with your job that you are rude to others then find another job.