Whenever I go out to eat with friends, they always look at my dish and it’s clear they want some. It drives me crazy, and I guess I just don’t like to share food. I find it unhygienic, disruptive and annoying because I often pick what I know I will eat, etc. a few times now my friends have had to ask me, with a resentful tone, if they could have some of what I ordered. Almost like, annoyed that I didn’t offer them some. I never look at their dish lustfully nor expect some of their food. So am I being rude for not offering? Is this some unspoken social rule I’m missing?