I understand where you're coming from. But as another member on here posted, the pastor wrote on the receipt so it would be read. It was read. All the waitress did was to post a photo of the receipt on the internet. It's not a private document. She had no contact with the customer agreeing to keep her receipt private. The customer acted sh1tty and it came back to bite her.
And btw, I'm not a waitress.
Resist the temptation to feed the trolls.