It's not just a matter of personal preference, it's a matter of intergalactic law. Don't touch someone else's spaceship, their space helmet, or their carefully crafted asteroid collection.
Don't talk about the events of the past, present, or future. It's rude to bring up old space battles, and it's just plain confusing to talk about events that haven't happened yet. Stick to the present, and try not to make eye contact with the space-time continuum.
It's not just about not eating, it's about not even thinking about eating. The Void Space Cafeteria is a place of business, not a snack bar. Don't even think about the free asteroid ice cream, or the zero-gravity nachos.
It's not just about not taking pictures, it's about not even thinking about taking pictures. The Void Space Meeting Room is not a studio, and the other meeting attendees are not your personal space-co-stars.