There was a link further down in the comments at the OP. Nick is apparently abrasive. He's also not a very good money manager and has had run ins with people he owes money to like the IRS and landlord. But, he apparently has (or had) a shop near Capital Hill that everyone loved and people revolted when they closed him down. I don't know if he's back there or just running the shop above in Arlington VA.
I still agree with him for sticking to his principles and telling the customer where to go. After all, the guy threatened to come into his shop with matches and gasoline. And he wrote obsenities on his tip money. So, while juvenile, he started it. I bet that employee felt good about the owner defending him.