I'll start by saying I almost never buy anything at the snack bar, but it doesn't bother me that much.
Food is incredibly tangled up in socialization. The movies, museums -hell, even IKEA, the mall.
You meet friends for coffee, dinner, lunch. If you have them over, something is offered/provided.
I have a monthly staff meeting and snacks are provided every time, and everyone imbibes during the meeting.
I've heard tell of patrons bringing in full meals to a theater..McDonalds or even fried chicken. I imagine the smell would be most distracting and that makes it pretty rude.
Once theaters got a taste of extra money, it became ingrained.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.