it bugs me when people:

fish-lip (although im guilty on occasion, sorry)
hog the communal piece/j/blunt/bong
flip out/get hyper as fuck when they're high
hit out of turn
don't care that they hit out of turn
try and steal my shit
talk about smoking around other people
don't respect the rules
never pay or repay for the weed

those are pretty much my rules...RESPECT IT BITCHES! lol