I am asking this because i met a person who also display such behaviour and it appeared to me that the person is taking advantage of the situation. unlike you, he didn't give any tips whatsoever.
I was at a Bar counter having nice drink. This person, a customer. who arrived, sitting next to me, and get a drink. It appeared to me that this person knew the bartender really well based on how they communicate with each other, like good pals. The bartender is a friendly and easy going person. Long story short. The customer went to a nearby stall to get a bowl of ramen and bought it over to the bar counter to eat it.
I can tell that the friendly Bartender is not comfortable with it but said that if the boss is not saying anything, then it is ok.
That customer uses the whole good relationship thing with the bartender and take advantage of the whole situation, in the expense of the bartender position, to get himself convenient with the whole drinking period. He doesn't care if his action will put the bartender in a difficult position. However, taking advantage of the good rapport with the bartender, it will help him to do whatever he wants. The cctv is there and capture the whole situation. if the boss questioned the bartender, he will be in a difficult position to explain things.
I have a terrible impression of that customer. I cut the conversation short with him when he tried to chat with me. finish my drink and i leave.