I don't let them all up in my space when I am feeding. If either of them want their food before I am out of the stall I'm just going to stay in there even longer until I decide they can now eat. Both my mares have their moments where they want their dinner when they want it, but generally they're good about it and wait until I "say" they can eat.
Probably my biggest no-no is rushing past me. Rarely happens but when it does, holy cow watch out, I will not be a happy camper. Usually happens when my mares are the last in and they want dinner NOW. These usually wind up being the days I stay in the stall until I feel they're keeping out of my space and until they actually deserve their dinner.
On that same note, I won't tolerate door kicking or being a general nuisance in the stall (again, generally this is at feeding time). Both girls are usually pretty good about this, but there has been the odd time where I am sure I've gotten looks from boarders for doing the notorious yell/growl at my horses.