Not sure if your thread was in jest or not ?? but I would find that extremely hard to believe. It would be very un-Disney like to post such a sign, breaks some of their core principles.
I guess it's up to us DISers to keep on spreading the Magic in the parks and hope that it rubs off on all those sour people!
hey-- i have a good idea- since we know disney will never post a sign like that- all DIS board members should get shirts priinted up with that saying--
this way we can stand next to each other in the parade lines, ride lines, counter service lines
( maybe save a table or two!! )
.....someone will always have your back when you get frustrated by a rude person!