How can we educate the “average” person about proper gym etiquette?

It seems that whenever I use a gym facility I always see the same scenarios:People using a bench to rest their weight in between sets, people sitting on a bench talking, people dropping their weights after grunting.
Is there not any review for patrons when they join a gym?
I personally only train outdoors, so when I am forced inside I find so many interesting human behaviors going on other than actual working out.