lol smowball... just because they werent dressed or behaving like everyone else they still probably went out for dinner because they were hungry. Its not a set in stone rule you have to communicate with each other either... im not getting at you by saying that, its just my view..... personally if someone wasnt dressed like everyone else (ive never dressed like most people) or fiddling with stuff i would just ignore it, like you said they werent rowdy....
i dont really bother seeing whos in restaurants before i go in them, i have lots of family who own restaurants in most towns from here to lands end lol so i would just go in one of those if i was hungry and they were nearby.... and if annoying folk did come in i would just take my food in the back or upstairs if it bothered me too much lol