Well, there's been an update to the story of the ex-marine who claimed she wasn't left a tip because she's gay. The family who allegedly left the nasty note says not only did they not leave that note, but they actually tipped her 20%! They provided their customer receipt and their credit card statement as proof.
So, I'm not sure who is telling the truth or not. But, if you were planning on donating money to this waitress to correct an injustice, you may want to rethink that.