<human>: Give me the gist of the text in a nutshell

Obviously a throwaway... Full story:
It was my brother's birthday party and since I didn't get him anything specific for his birthday, I decided to pay for all his drinks at the bar.

Fast forward through a great night and one of his friends (whom I've never met) leaves after the waitress started collecting the tabs. This douchebag friend of my brother's gave the waitress his credit card and told her he was going for a smoke while she charged his card. He never came back and the card bounced. After a while, the waitress confronted my brother about it and really hassled him and pressured him to pay for it since the card was declined and the guy obviously wasn't coming back. Since I was the one paying for his bill - and more importantly taking responsibility for my brother having a good time - I paid for his douchebag friend. The bill was 50$ and the guy never answered his phone.

The next day, I found him via facebook and told messaged him that it was a TOTAL dick move to pay for his booze via a bad credit card during my brother's birthday. He told me tough shit: I should have left the waitress to take the blame. When I told him that was even worse, he blocked me. That pissed me off because I was polite and 100% reasonable. Unfortunately for him, I have his credit card number, full name and address. So here's the question to you: reddit. What can I do to get my 50$ back? I realize 50$ isn't very much money (although apparently it is for this broke douchebag), but it's not about the money... it's about the principle! What is the best approach to this? Ignore it and absorb the 50$? Or is there some obscure legal way to bring this asshole to justice? 50$ isn't very much but because he's acting like such an ASSHOLE I'm willing to go far with this if only so he doesn't win.
<bot>: Guy at my brother's bday party left me with his 50$ bill. What's the best what to get back at him?