Tonight at work I was working a table of two people who come in every three days. I kept bouncing back and forth between a few customers and them a few times with three hours about. I'd talk to them about their personal life,things I have going on,ect. And I served them multiple drinks (I am RAMP certified In case anyone's going to ask about it for some reason). At the end of there stay I gave them the bill, they said goodbye and we hugged and I went on to the other tables. When I came back I took the book and saw a tip and it was way bigger than usual, I was visually shocked and it was too late to chase them down to confirm it was intentional. This woman that was directly beside them got upset with me, telling me I don't deserve the tip and that I took advantage of the customers because they were drunk and in this economy they definitely need the money and a whole bunch of stuff, and they weren't drunk or at least they seemed very very sober. I don't care a whole lot about what she said but I am feeling kind of guilty. I could have put the money in an envelope or something for next time they came back in or something instead of accepting it. AITAH?