Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: This happened quite a while ago, but it's a situation I think about from time to time. I'm curious as to what Reddit thinks about it.

It was my friend's birthday. We'll call her M. She invited a few friends to go bar hopping, including a friend we'll call C. C's brother offered to be the designated driver for us. As the night progresses, C's brother buys us round after round of drinks. We did not ask him to do that. He just ordered for us, one right after the other. We got pretty toasty, so looking back, I probably would not have allowed him to spend so much money on me if I wasn't.

The next day, M told me that C's brother wanted about $50 repayment from each of us for the drinks. I said absolutely not. No one forced him to buy drinks for him all night, and we never agreed to reimburse him for it. Needless to say, C and her brother were pissed and refused to talk to me, though it wasn't like we were close to begin with.

I should add that he did not make a pass at me, and I was not flirting with him whatsoever. There was no romance involved in the situation. He bought drinks for everyone.

So AITA?

refusing to reimburse for drinks