When a girl friend of mine and I were spending time in a quiet lounge bar, the waitress brought us two drinks of the kind we ordered before and told us they were already paid for by a dude. When we wanted to know who the dude was she looked back and said he just left for the restroom. We were almost done with our drinks and I was kind of pissed because we actually wanted to leave. So then we had this little discussion. My friend thought it was rude to decline an offer that is already been paid for. I thought it was rude to accept an offer when you had no interest in getting to know the guy. What's the right thing to do here?