We don't like you, go away
Hey, I know that your last customer was a jerk. I know that you get asked the same stupid questions over and over. I know that people don't appreciate you, they're boors, they're selfish, they're in a hurry.
But, here's the thing: I'm not those people. I've never been here before. I didn't do anything wrong! Don't blame me for them.
If you're going to be in the service business, you need to accept that or you're going to hate it and be lousy at it, both at the same time.