He did that after discovering that the stranger tipped one of his favorite waitresses just 74 cents.
But it wasn't just the name-calling that had some on the side of the skimpy tipper.
Senator Declan O'Scanlon actually published a photo of the $119 bill with the man's full name, signature and last four digits of his debit card.
In the Republican politician's tweet, he called diner Anthony Dierolf a jerk with misplaced obnoxiousness and said Ashley is a great waitress and a wonderful human being.
Wow...have to work to qualify for my calling you out specifically as a jerk. But Anthony Dierlof qualifies. Ashley is a great waitress and wonderful human being. Certainly not a malicious bone in her body. Makes Anthony...a jerk. Live with your misplaced obnoxiousness. pic.twitter.com/vbqtNVEjIE— Declan O'Scanlon (@declanoscanlon) August 14, 2019
Though most applauded the lawmaker for standing up for Ashley, others questioned whether it was appropriate or even legal for an elected official to expose someone.
But both O'Scanlon and the customer, Dierolf, are standing by their behavior.
O'Scanlon says the information he posted is something left on countless restaurant tables and even shared a receipt of his own.
As for Dierolf, he told a newspaper he gave Ashley a terrible tip because the service was terrible and slow.
He's now considering taking legal action against O'Scanlon.