I make a lot of calls to doctors offices in the course of my job, and it surprises me how many receptionist answering phones are blatantly rude. Like, before I've even opened my mouth to say hello.
I understand that everyone has bad days and everyone can't be a bundle of personality, but if your job is to communicate with people, maybe it's better not to sound outright angry when you pick up the phone. Maybe you hate your job, but at least try not to sound like you hate the person who is calling. If you have the sort of personality where you cannot be pleasant to strangers, then you should not have a job where you have to communicate with people so frequently.
Why would anyone hire a receptionist who is so unpleasant anyway?