One of my friends wanted to watch a fight on TV but had no subscription to the channel that it was on. I do have a subscription but have no interest in watching fights, however I said that he and his friend could come to my house at 7pm to watch it and we can drink wine together. They bought a bottle of wine and I also provided a bottle.
While the match was on, I was in the room, but was reading as I don't like to see people fight. I wasn't completely engrossed in the book and we did chat and drink the wine. When the fight was over, we played cards, talked and opened another bottle. During the evening, my friend asked if I had any chocolate and I went to the kitchen and got a medium bar of chocolate and gave it to them. I had a small amount of chocolate as I don't usually eat late in the evening and they had the rest. They didn't ask for any more food and it didn't occur to offer anything else. They left around 11pm.
The next day, when we were talking, they mentioned that it was strange that I didn't offer them any food. I would have happily fed them, but I had already had dinner and assumed they had too and I don't usually eat that late. It simply didn't occur to me to start eating. WIBU to not offer more food? I am worried that I'm missing some obvious social standard that everyone else adheres to and I've been being a poor host.