|Come back with my tip!!!|
Revenge is a dish best served on the Internet. Humphrey is taking pictures of the restaurant receipts with zero or bad tips, and posting them on her Facebook page. Incidentally, Humphrey's page is private so the general public can't see it -- or so I've been told.
Now, some of us, your truly included, get censored at some point in our writing careers for expressing our opinions. In general, there is nothing illegal about a private employer requesting that an employee refrain from some speech. Not very different from requiring that employees remove the nose ring while working. (No, Freedom of Speech does not apply here.*)
There is also nothing illegal about what Ms. Humphrey is doing. She is not posting credit card numbers, just names and proof of cheap behavior. She is embarrassing people (who are smart enough to know they should be embarrassed) for being cheapskates. No lies, no slander. I think I like this woman.
*In short, Freedom of Speech prevents the government from stopping (peaceful) public assembly and expression. Hate speech has become an exception to this rule. Private employers may not discriminate. But I'm just a stupid waitress, so you should probably read the Constitution for yourself.